diff --git a/backend/src/inventory/inventory.security.spec.ts b/backend/src/inventory/inventory.security.spec.ts
index 2c888cf9..05acd3e4 100644
--- a/backend/src/inventory/inventory.security.spec.ts
+++ b/backend/src/inventory/inventory.security.spec.ts
@@ -1,27 +1,9 @@
-import { ExecutionContext, ForbiddenException, UnauthorizedException } from '@nestjs/common';
+import { ForbiddenException, UnauthorizedException } from '@nestjs/common';
 import { Reflector } from '@nestjs/core';
 import { JwtAuthGuard } from '../auth/jwt-auth.guard';
-import { ROLES_KEY } from '../auth/decorators/roles.decorator';
 import { RolesGuard } from '../auth/roles.guard';
 import { InventoryController } from './inventory.controller';
-
-type MockHttpContextOptions = {
-  handler: Function;
-  clazz: Function;
-  user?: any;
-};
-
-function mockHttpContext(options: MockHttpContextOptions): ExecutionContext {
-  return {
-    getClass: () => options.clazz,
-    getHandler: () => options.handler,
-    switchToHttp: () => ({
-      getRequest: () => ({ user: options.user }),
-      getResponse: () => ({}),
-      getNext: () => undefined,
-    }),
-  } as unknown as ExecutionContext;
-}
+import { getRolesMetadata, mockHttpContext } from '../test-utils/security-test-helpers';
 
 describe('Inventory admin security', () => {
   const adminHandlers: Array<[string, Function]> = [
@@ -33,9 +15,10 @@ describe('Inventory admin security', () => {
     ['previewMergeAdmin', InventoryController.prototype.previewMergeAdmin],
   ];
 
-  it.each(adminHandlers)('admin-endpoint %s har @Roles("admin") metadata', (_name, handler) => {
-    const roles = Reflect.getMetadata(ROLES_KEY, handler) as string[] | undefined;
-    expect(roles).toEqual(['admin']);
+  it('alla admin-endpoints har @Roles("admin") metadata', () => {
+    for (const [, handler] of adminHandlers) {
+      expect(getRolesMetadata(handler)).toEqual(['admin']);
+    }
   });
 
   it.each(adminHandlers)('RolesGuard nekar icke-admin (403) på %s', (_name, handler) => {
diff --git a/backend/src/meal-plan/meal-plan.idor.spec.ts b/backend/src/meal-plan/meal-plan.idor.spec.ts
new file mode 100644
index 00000000..b22adc74
--- /dev/null
+++ b/backend/src/meal-plan/meal-plan.idor.spec.ts
@@ -0,0 +1,134 @@
+import { NotFoundException } from '@nestjs/common';
+import { MealPlanService } from './meal-plan.service';
+
+describe('MealPlanService IDOR security', () => {
+  const fromDate = '2026-05-01';
+  const toDate = '2026-05-07';
+
+  const prismaMock = {
+    mealPlanEntry: {
+      findMany: jest.fn(),
+      findUnique: jest.fn(),
+      upsert: jest.fn(),
+      delete: jest.fn(),
+    },
+    inventoryItem: {
+      findMany: jest.fn(),
+    },
+    pantryItem: {
+      findMany: jest.fn(),
+    },
+    recipe: {
+      findUnique: jest.fn(),
+    },
+    $transaction: jest.fn(),
+  };
+
+  const service = new MealPlanService(prismaMock as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  const mockEmptyRangeData = () => {
+    prismaMock.mealPlanEntry.findMany.mockResolvedValue([]);
+    prismaMock.inventoryItem.findMany.mockResolvedValue([]);
+    prismaMock.pantryItem.findMany.mockResolvedValue([]);
+  };
+
+  it('scopar findByRange till userId', async () => {
+    mockEmptyRangeData();
+
+    await service.findByRange(42, fromDate, toDate);
+
+    expect(prismaMock.mealPlanEntry.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({
+          userId: 42,
+          date: expect.any(Object),
+        }),
+      }),
+    );
+  });
+
+  it('scopar shoppingList till userId', async () => {
+    mockEmptyRangeData();
+
+    await service.shoppingList(42, fromDate, toDate);
+
+    expect(prismaMock.mealPlanEntry.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({
+          userId: 42,
+        }),
+      }),
+    );
+  });
+
+  it('scopar inventoryCompare till userId', async () => {
+    mockEmptyRangeData();
+
+    await service.inventoryCompare(42, fromDate, toDate);
+
+    expect(prismaMock.mealPlanEntry.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({
+          userId: 42,
+        }),
+      }),
+    );
+  });
+
+  it('upsert sätter userId på nya matplansintrag', async () => {
+    prismaMock.mealPlanEntry.upsert.mockResolvedValue({
+      id: 1,
+      userId: 42,
+      date: new Date(),
+    });
+
+    await service.upsert(42, { date: '2026-05-11', recipeId: 1 } as any);
+
+    expect(prismaMock.mealPlanEntry.upsert).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({
+          userId_date: expect.objectContaining({
+            userId: 42,
+          }),
+        }),
+        create: expect.objectContaining({
+          userId: 42,
+        }),
+      }),
+    );
+  });
+
+  it('removeByDate nekar access för annan user', async () => {
+    prismaMock.mealPlanEntry.findUnique.mockResolvedValue(null);
+
+    await expect(service.removeByDate(42, '2026-05-11')).rejects.toThrow(NotFoundException);
+
+    expect(prismaMock.mealPlanEntry.findUnique).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({
+          userId_date: expect.objectContaining({
+            userId: 42,
+          }),
+        }),
+      }),
+    );
+  });
+
+  it('removeByDate verifierar userId innan radering', async () => {
+    const entry = { id: 1, userId: 42, date: new Date() };
+    prismaMock.mealPlanEntry.findUnique.mockResolvedValue(entry);
+    prismaMock.mealPlanEntry.delete.mockResolvedValue(entry);
+
+    await service.removeByDate(42, '2026-05-11');
+
+    expect(prismaMock.mealPlanEntry.delete).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({ id: 1 }),
+      }),
+    );
+  });
+});
diff --git a/backend/src/meal-plan/meal-plan.security.spec.ts b/backend/src/meal-plan/meal-plan.security.spec.ts
new file mode 100644
index 00000000..f8d124bf
--- /dev/null
+++ b/backend/src/meal-plan/meal-plan.security.spec.ts
@@ -0,0 +1,80 @@
+import { UnauthorizedException } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { JwtAuthGuard } from '../auth/jwt-auth.guard';
+import { MealPlanController } from './meal-plan.controller';
+
+describe('MealPlan controller security', () => {
+  const makeUser = (overrides: Partial<{ userId: number; role: string }> = {}) => ({
+    userId: 42,
+    role: 'user',
+    ...overrides,
+  });
+
+  const mealPlanServiceMock = {
+    findByRange: jest.fn(),
+    shoppingList: jest.fn(),
+    inventoryCompare: jest.fn(),
+    upsert: jest.fn(),
+    removeByDate: jest.fn(),
+  };
+
+  const controller = new MealPlanController(mealPlanServiceMock as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('JwtAuthGuard kräver autentisering på findByRange', () => {
+    const guard = new JwtAuthGuard(new Reflector());
+
+    expect(() => guard.handleRequest(null, null, null)).toThrow(UnauthorizedException);
+  });
+
+  it('JwtAuthGuard tillåter autentiserad användare på findByRange', () => {
+    const guard = new JwtAuthGuard(new Reflector());
+    const user = makeUser({ userId: 1 });
+
+    expect(guard.handleRequest(null, user, null)).toBe(user);
+  });
+
+  it('findByRange vidarebefordrar @CurrentUser.userId till service', () => {
+    mealPlanServiceMock.findByRange.mockResolvedValue([]);
+
+    controller.findByRange(makeUser(), '2026-05-01', '2026-05-07');
+
+    expect(mealPlanServiceMock.findByRange).toHaveBeenCalledWith(42, '2026-05-01', '2026-05-07');
+  });
+
+  it('shoppingList vidarebefordrar @CurrentUser.userId till service', () => {
+    mealPlanServiceMock.shoppingList.mockResolvedValue([]);
+
+    controller.shoppingList(makeUser(), '2026-05-01', '2026-05-07');
+
+    expect(mealPlanServiceMock.shoppingList).toHaveBeenCalledWith(42, '2026-05-01', '2026-05-07');
+  });
+
+  it('inventoryCompare vidarebefordrar @CurrentUser.userId till service', () => {
+    mealPlanServiceMock.inventoryCompare.mockResolvedValue([]);
+
+    controller.inventoryCompare(makeUser(), '2026-05-01', '2026-05-07');
+
+    expect(mealPlanServiceMock.inventoryCompare).toHaveBeenCalledWith(42, '2026-05-01', '2026-05-07');
+  });
+
+  it('upsert vidarebefordrar @CurrentUser.userId till service', () => {
+    const dto = { date: '2026-05-11', recipeId: 1 };
+    mealPlanServiceMock.upsert.mockResolvedValue({ id: 1 });
+
+    controller.upsert(makeUser(), dto as any);
+
+    expect(mealPlanServiceMock.upsert).toHaveBeenCalledWith(42, dto);
+  });
+
+  it('removeByDate vidarebefordrar @CurrentUser.userId till service', () => {
+    mealPlanServiceMock.removeByDate.mockResolvedValue(undefined);
+
+    controller.removeByDate(makeUser(), '2026-05-11');
+
+    expect(mealPlanServiceMock.removeByDate).toHaveBeenCalledWith(42, '2026-05-11');
+  });
+});
diff --git a/backend/src/pantry/pantry.idor.spec.ts b/backend/src/pantry/pantry.idor.spec.ts
new file mode 100644
index 00000000..c3506ddb
--- /dev/null
+++ b/backend/src/pantry/pantry.idor.spec.ts
@@ -0,0 +1,125 @@
+import { NotFoundException } from '@nestjs/common';
+import { PantryService } from './pantry.service';
+
+describe('PantryService IDOR security', () => {
+  const makeCreatePantryDto = (overrides: Partial<{ productId: number; userId: number }> = {}) => ({
+    productId: 1,
+    ...overrides,
+  });
+
+  const prismaMock = {
+    pantryItem: {
+      findMany: jest.fn(),
+      findUnique: jest.fn(),
+      findFirst: jest.fn(),
+      create: jest.fn(),
+      update: jest.fn(),
+      delete: jest.fn(),
+    },
+    product: {
+      findUnique: jest.fn(),
+    },
+    user: {
+      findUnique: jest.fn(),
+    },
+    inventoryItem: {
+      create: jest.fn(),
+    },
+    $transaction: jest.fn(),
+  };
+
+  const service = new PantryService(prismaMock as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  const mockPantryFindManyEmpty = () => {
+    prismaMock.pantryItem.findMany.mockResolvedValue([]);
+  };
+
+  it('scopar findAll till userId', async () => {
+    mockPantryFindManyEmpty();
+
+    await service.findAll(42);
+
+    expect(prismaMock.pantryItem.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({ userId: 42 }),
+      }),
+    );
+  });
+
+  it('findAllAdmin kan filtrera per userId', async () => {
+    mockPantryFindManyEmpty();
+
+    await service.findAllAdmin({ userId: 99 });
+
+    expect(prismaMock.pantryItem.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({ userId: 99 }),
+      }),
+    );
+  });
+
+  it('findAllAdmin returnerar alla items om userId inte specificeras', async () => {
+    mockPantryFindManyEmpty();
+
+    await service.findAllAdmin({});
+
+    expect(prismaMock.pantryItem.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: {},
+      }),
+    );
+  });
+
+  it('create sätter userId på nya pantry-items', async () => {
+    prismaMock.product.findUnique.mockResolvedValue({ id: 1 });
+    prismaMock.pantryItem.create.mockResolvedValue({ id: 1, userId: 42 });
+
+    await service.create(42, makeCreatePantryDto() as any);
+
+    expect(prismaMock.pantryItem.create).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({ userId: 42, productId: 1 }),
+      }),
+    );
+  });
+
+  it('createAdmin kan skapa pantry-item för explicit userId', async () => {
+    prismaMock.user.findUnique.mockResolvedValue({ id: 99 });
+    prismaMock.product.findUnique.mockResolvedValue({ id: 1 });
+    prismaMock.pantryItem.create.mockResolvedValue({ id: 1, userId: 99 });
+
+    await service.createAdmin(1, makeCreatePantryDto({ userId: 99 }) as any, 99);
+
+    expect(prismaMock.pantryItem.create).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({ userId: 99, productId: 1 }),
+      }),
+    );
+  });
+
+  it('createAdmin throws NotFoundException om target user saknas', async () => {
+    prismaMock.user.findUnique.mockResolvedValue(null);
+
+    await expect(service.createAdmin(1, makeCreatePantryDto({ userId: 999 }) as any, 999)).rejects.toThrow(
+      NotFoundException,
+    );
+  });
+
+  it('remove nekar icke-owner', async () => {
+    // Simulera att item inte hittas (userId matchar inte)
+    prismaMock.pantryItem.findFirst.mockResolvedValue(null);
+
+    await expect(service.remove(42, 1)).rejects.toThrow(NotFoundException);
+  });
+
+  it('moveToInventory nekar icke-owner', async () => {
+    // Simulera att item inte hittas (userId matchar inte)
+    prismaMock.pantryItem.findFirst.mockResolvedValue(null);
+
+    await expect(service.moveToInventory(42, 1, {} as any)).rejects.toThrow(NotFoundException);
+  });
+});
diff --git a/backend/src/pantry/pantry.security.spec.ts b/backend/src/pantry/pantry.security.spec.ts
new file mode 100644
index 00000000..918fb229
--- /dev/null
+++ b/backend/src/pantry/pantry.security.spec.ts
@@ -0,0 +1,59 @@
+import { ForbiddenException, UnauthorizedException } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { JwtAuthGuard } from '../auth/jwt-auth.guard';
+import { RolesGuard } from '../auth/roles.guard';
+import { PantryController } from './pantry.controller';
+import { getRolesMetadata, mockHttpContext } from '../test-utils/security-test-helpers';
+
+describe('Pantry admin security', () => {
+  const adminHandlers: Array<[string, Function]> = [
+    ['findAllAdmin', PantryController.prototype.findAllAdmin],
+    ['createAdmin', PantryController.prototype.createAdmin],
+    ['updateAdmin', PantryController.prototype.updateAdmin],
+    ['removeAdmin', PantryController.prototype.removeAdmin],
+    ['moveToInventoryAdmin', PantryController.prototype.moveToInventoryAdmin],
+  ];
+
+  it('alla admin-endpoints har @Roles("admin") metadata', () => {
+    for (const [, handler] of adminHandlers) {
+      expect(getRolesMetadata(handler)).toEqual(['admin']);
+    }
+  });
+
+  it.each(adminHandlers)('RolesGuard nekar icke-admin (403) på %s', (_name, handler) => {
+    const reflector = new Reflector();
+    const guard = new RolesGuard(reflector);
+    const context = mockHttpContext({
+      handler,
+      clazz: PantryController,
+      user: { role: 'user' },
+    });
+
+    expect(() => guard.canActivate(context)).toThrow(ForbiddenException);
+  });
+
+  it.each(adminHandlers)('RolesGuard tillåter admin (200/allow) på %s', (_name, handler) => {
+    const reflector = new Reflector();
+    const guard = new RolesGuard(reflector);
+    const context = mockHttpContext({
+      handler,
+      clazz: PantryController,
+      user: { role: 'admin' },
+    });
+
+    expect(guard.canActivate(context)).toBe(true);
+  });
+
+  it('JwtAuthGuard mappar saknad användare till 401', () => {
+    const guard = new JwtAuthGuard(new Reflector());
+
+    expect(() => guard.handleRequest(null, null, null)).toThrow(UnauthorizedException);
+  });
+
+  it('JwtAuthGuard släpper igenom autentiserad användare (200/allow)', () => {
+    const guard = new JwtAuthGuard(new Reflector());
+    const user = { userId: 42, role: 'user' };
+
+    expect(guard.handleRequest(null, user, null)).toBe(user);
+  });
+});
diff --git a/backend/src/products/products.security.spec.ts b/backend/src/products/products.security.spec.ts
new file mode 100644
index 00000000..4a361247
--- /dev/null
+++ b/backend/src/products/products.security.spec.ts
@@ -0,0 +1,119 @@
+import { IS_PUBLIC_KEY } from '../auth/decorators/public.decorator';
+import { ProductsController } from './products.controller';
+import { getRolesMetadata } from '../test-utils/security-test-helpers';
+
+describe('Products controller security', () => {
+  const productsServiceMock = {
+    findByOwner: jest.fn(),
+    findOne: jest.fn(),
+    createPrivate: jest.fn(),
+    createPending: jest.fn(),
+    updateCanonicalNamePrivate: jest.fn(),
+    mergePrivate: jest.fn(),
+  };
+
+  const aiServiceMock = {
+    suggestCategory: jest.fn(),
+  };
+
+  const categoriesServiceMock = {
+    findFlattened: jest.fn(),
+  };
+
+  const controller = new ProductsController(
+    productsServiceMock as any,
+    aiServiceMock as any,
+    categoriesServiceMock as any,
+  );
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it.each([
+    ['findAll', ProductsController.prototype.findAll],
+    ['findAllTags', ProductsController.prototype.findAllTags],
+  ])('endpoint %s har @Public metadata', (_name, handler) => {
+    const isPublic = Reflect.getMetadata(IS_PUBLIC_KEY, handler) as boolean | undefined;
+    expect(isPublic).toBe(true);
+  });
+
+  it('alla admin-endpoints har @Roles("admin") metadata', () => {
+    for (const [, handler] of [
+      ['findDuplicates', ProductsController.prototype.findDuplicates],
+      ['previewMerge', ProductsController.prototype.previewMerge],
+      ['backfillCanonical', ProductsController.prototype.backfillCanonical],
+      ['findPending', ProductsController.prototype.findPending],
+      ['findPrivate', ProductsController.prototype.findPrivate],
+      ['aiCategorizeBulk', ProductsController.prototype.aiCategorizeBulk],
+      ['findDeleted', ProductsController.prototype.findDeleted],
+      ['create', ProductsController.prototype.create],
+      ['merge', ProductsController.prototype.merge],
+      ['updateCanonicalName', ProductsController.prototype.updateCanonicalName],
+      ['setTags', ProductsController.prototype.setTags],
+      ['upsertNutrition', ProductsController.prototype.upsertNutrition],
+      ['update', ProductsController.prototype.update],
+      ['promotePrivateToGlobal', ProductsController.prototype.promotePrivateToGlobal],
+      ['permanentDelete', ProductsController.prototype.permanentDelete],
+      ['remove', ProductsController.prototype.remove],
+      ['setStatus', ProductsController.prototype.setStatus],
+      ['restore', ProductsController.prototype.restore],
+      ['resetAll', ProductsController.prototype.resetAll],
+      ['bulkUpdate', ProductsController.prototype.bulkUpdate],
+    ]) {
+      expect(getRolesMetadata(handler as Function)).toEqual(['admin']);
+    }
+  });
+
+  it('findMine vidarebefordrar req.user.id till owner-scope', () => {
+    productsServiceMock.findByOwner.mockResolvedValue([]);
+
+    controller.findMine({ user: { id: 42 } } as any);
+
+    expect(productsServiceMock.findByOwner).toHaveBeenCalledWith(42);
+  });
+
+  it('createPrivate vidarebefordrar req.user.id', () => {
+    const dto = { name: 'Private Product' };
+    productsServiceMock.createPrivate.mockResolvedValue({ id: 1 });
+
+    controller.createPrivate(dto as any, { user: { id: 42 } } as any);
+
+    expect(productsServiceMock.createPrivate).toHaveBeenCalledWith(dto, 42);
+  });
+
+  it('createPending vidarebefordrar req.user.id', () => {
+    const dto = { name: 'Pending Product' };
+    productsServiceMock.createPending.mockResolvedValue({ id: 1 });
+
+    controller.createPending(dto as any, { user: { id: 42 } } as any);
+
+    expect(productsServiceMock.createPending).toHaveBeenCalledWith(dto, 42);
+  });
+
+  it('updateCanonicalNamePrivate vidarebefordrar req.user.id', () => {
+    productsServiceMock.updateCanonicalNamePrivate.mockResolvedValue({ id: 1 });
+
+    controller.updateCanonicalNamePrivate(1, { canonicalName: 'milk' } as any, { user: { id: 42 } } as any);
+
+    expect(productsServiceMock.updateCanonicalNamePrivate).toHaveBeenCalledWith(42, 1, 'milk');
+  });
+
+  it('mergePrivate vidarebefordrar req.user.id', () => {
+    productsServiceMock.mergePrivate.mockResolvedValue({ merged: true });
+
+    controller.mergePrivate({ sourceProductId: 10, targetProductId: 20 } as any, { user: { id: 42 } } as any);
+
+    expect(productsServiceMock.mergePrivate).toHaveBeenCalledWith(42, 10, 20);
+  });
+
+  it('suggestCategory använder canonicalName fallback name', async () => {
+    productsServiceMock.findOne.mockResolvedValue({ id: 1, name: 'Mjolk', canonicalName: 'Mjolk 1L' });
+    categoriesServiceMock.findFlattened.mockResolvedValue([{ id: 1, name: 'Mejeri' }]);
+    aiServiceMock.suggestCategory.mockResolvedValue({ categoryId: 1 });
+
+    await controller.suggestCategory(1);
+
+    expect(aiServiceMock.suggestCategory).toHaveBeenCalledWith('Mjolk 1L', [{ id: 1, name: 'Mejeri' }]);
+  });
+});
diff --git a/backend/src/receipt-alias/receipt-alias.security.spec.ts b/backend/src/receipt-alias/receipt-alias.security.spec.ts
new file mode 100644
index 00000000..d6ebd281
--- /dev/null
+++ b/backend/src/receipt-alias/receipt-alias.security.spec.ts
@@ -0,0 +1,40 @@
+import { ReceiptAliasController } from './receipt-alias.controller';
+
+describe('ReceiptAlias controller security', () => {
+  const receiptAliasServiceMock = {
+    findAllForUser: jest.fn(),
+    upsert: jest.fn(),
+    remove: jest.fn(),
+  };
+
+  const controller = new ReceiptAliasController(receiptAliasServiceMock as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('findAll scopear till @CurrentUser userId + role', () => {
+    receiptAliasServiceMock.findAllForUser.mockResolvedValue([]);
+
+    controller.findAll({ userId: 42, role: 'user' });
+
+    expect(receiptAliasServiceMock.findAllForUser).toHaveBeenCalledWith(42, 'user');
+  });
+
+  it('upsert scopear till @CurrentUser userId + role', () => {
+    const dto = { receiptName: 'Mjolk', productName: 'Mjolk' };
+    receiptAliasServiceMock.upsert.mockResolvedValue({ id: 1 });
+
+    controller.upsert(dto as any, { userId: 42, role: 'admin' });
+
+    expect(receiptAliasServiceMock.upsert).toHaveBeenCalledWith(dto, 42, 'admin');
+  });
+
+  it('remove scopear till @CurrentUser userId + role', () => {
+    receiptAliasServiceMock.remove.mockResolvedValue({ removed: true });
+
+    controller.remove(10, { userId: 42, role: 'user' });
+
+    expect(receiptAliasServiceMock.remove).toHaveBeenCalledWith(10, 42, 'user');
+  });
+});
diff --git a/backend/src/receipt-import/receipt-import.security.spec.ts b/backend/src/receipt-import/receipt-import.security.spec.ts
new file mode 100644
index 00000000..77f1cc05
--- /dev/null
+++ b/backend/src/receipt-import/receipt-import.security.spec.ts
@@ -0,0 +1,86 @@
+import { BadRequestException } from '@nestjs/common';
+import { ReceiptImportController } from './receipt-import.controller';
+
+describe('ReceiptImport controller security', () => {
+  const receiptImportServiceMock = {
+    parseReceipt: jest.fn(),
+    upsertUnitMapping: jest.fn(),
+    saveReceipt: jest.fn(),
+  };
+
+  const controller = new ReceiptImportController(receiptImportServiceMock as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('parseReceipt nekar när fil saknas', async () => {
+    await expect(controller.parseReceipt(undefined, { user: { id: 1 } })).rejects.toThrow(BadRequestException);
+  });
+
+  it('parseReceipt nekar otillåten mime-type', async () => {
+    const file = { buffer: Buffer.from('x'), mimetype: 'text/plain' } as any;
+
+    await expect(controller.parseReceipt(file, { user: { id: 1 } })).rejects.toThrow(BadRequestException);
+  });
+
+  it('parseReceipt vidarebefordrar premium/admin och userId', async () => {
+    const file = { buffer: Buffer.from('x'), mimetype: 'image/jpeg' } as any;
+    receiptImportServiceMock.parseReceipt.mockResolvedValue([]);
+
+    await controller.parseReceipt(file, { user: { id: 42, role: 'admin', isPremium: false } });
+
+    expect(receiptImportServiceMock.parseReceipt).toHaveBeenCalledWith(file, true, 42);
+  });
+
+  it('upsertUnitMapping använder req.user.id när tillgänglig', async () => {
+    receiptImportServiceMock.upsertUnitMapping.mockResolvedValue({ ok: true });
+
+    await controller.upsertUnitMapping(
+      { productId: 1, originalUnit: 'g', preferredUnit: 'kg' } as any,
+      { user: { id: 42 } },
+    );
+
+    expect(receiptImportServiceMock.upsertUnitMapping).toHaveBeenCalledWith(42, 1, 'g', 'kg');
+  });
+
+  it('upsertUnitMapping fallbackar till req.user.userId', async () => {
+    receiptImportServiceMock.upsertUnitMapping.mockResolvedValue({ ok: true });
+
+    await controller.upsertUnitMapping(
+      { productId: 1, originalUnit: 'g', preferredUnit: 'kg' } as any,
+      { user: { userId: 99 } },
+    );
+
+    expect(receiptImportServiceMock.upsertUnitMapping).toHaveBeenCalledWith(99, 1, 'g', 'kg');
+  });
+
+  it('upsertUnitMapping nekar när användar-id saknas', async () => {
+    await expect(
+      controller.upsertUnitMapping({ productId: 1, originalUnit: 'g', preferredUnit: 'kg' } as any, { user: {} }),
+    ).rejects.toThrow(BadRequestException);
+  });
+
+  it('saveReceipt nekar global alias för icke-admin', async () => {
+    const dto = {
+      items: [{ learnAliasGlobally: true }],
+    };
+
+    await expect(controller.saveReceipt(dto as any, { user: { id: 42, role: 'user' } })).rejects.toThrow(
+      BadRequestException,
+    );
+
+    expect(receiptImportServiceMock.saveReceipt).not.toHaveBeenCalled();
+  });
+
+  it('saveReceipt tillåter global alias för admin', async () => {
+    const dto = {
+      items: [{ learnAliasGlobally: true }],
+    };
+    receiptImportServiceMock.saveReceipt.mockResolvedValue({ success: true });
+
+    await controller.saveReceipt(dto as any, { user: { userId: 42, role: 'admin' } });
+
+    expect(receiptImportServiceMock.saveReceipt).toHaveBeenCalledWith(42, dto);
+  });
+});
diff --git a/backend/src/recipes/recipes.idor.spec.ts b/backend/src/recipes/recipes.idor.spec.ts
new file mode 100644
index 00000000..e774dfe6
--- /dev/null
+++ b/backend/src/recipes/recipes.idor.spec.ts
@@ -0,0 +1,149 @@
+import { NotFoundException } from '@nestjs/common';
+import { RecipesService } from './recipes.service';
+
+describe('RecipesService IDOR security', () => {
+  const prismaMock = {
+    recipe: {
+      findUnique: jest.fn(),
+      findFirst: jest.fn(),
+      findMany: jest.fn(),
+      create: jest.fn(),
+      update: jest.fn(),
+      delete: jest.fn(),
+    },
+    recipeIngredient: {
+      findMany: jest.fn(),
+      create: jest.fn(),
+      deleteMany: jest.fn(),
+    },
+    product: {
+      findMany: jest.fn(),
+      findFirst: jest.fn(),
+    },
+    user: {
+      findUnique: jest.fn(),
+    },
+    recipeShare: {
+      findUnique: jest.fn(),
+      create: jest.fn(),
+      delete: jest.fn(),
+    },
+    $transaction: jest.fn(),
+  };
+
+  const aiServiceMock = {};
+  const recipeMatchingServiceMock = {};
+
+  const service = new RecipesService(prismaMock as any, aiServiceMock as any, recipeMatchingServiceMock as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  const setRecipeAsOwnedByAnotherUser = () => {
+    prismaMock.recipe.findUnique.mockResolvedValue({
+      id: 1,
+      ownerId: 100,
+    });
+  };
+
+  it('findAll scopar resultaten till userId (owner eller shared)', async () => {
+    prismaMock.recipe.findMany.mockResolvedValue([]);
+
+    await service.findAll(42);
+
+    expect(prismaMock.recipe.findMany).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: expect.objectContaining({
+          OR: expect.arrayContaining([
+            { ownerId: 42 },
+            { isPublic: true },
+            { shares: { some: { userId: 42 } } },
+          ]),
+        }),
+      }),
+    );
+  });
+
+  it('findOne nekar access om recipe inte är owner/shared/public', async () => {
+    prismaMock.recipe.findFirst.mockResolvedValue(null);
+
+    await expect(service.findOne(1, 42)).rejects.toThrow(NotFoundException);
+  });
+
+  it('findOne tillåter owner att läsa eget recipe', async () => {
+    prismaMock.recipe.findFirst.mockResolvedValue({
+      id: 1,
+      ownerId: 42,
+      isPublic: false,
+      name: 'Test Recipe',
+      description: '',
+      instructions: '',
+      mealPlanDayOfWeek: null,
+      imageUrl: null,
+      createdAt: new Date(),
+      updatedAt: new Date(),
+    });
+
+    const result = await service.findOne(1, 42);
+    expect(result).toBeDefined();
+  });
+
+  it('findOne tillåter shared user att läsa shared recipe', async () => {
+    prismaMock.recipe.findFirst.mockResolvedValue({
+      id: 1,
+      ownerId: 100,
+      isPublic: false,
+      shares: [{ userId: 42 }],
+    });
+
+    const result = await service.findOne(1, 42);
+    expect(result).toBeDefined();
+  });
+
+  it('findOne tillåter alla att läsa public recipe', async () => {
+    prismaMock.recipe.findFirst.mockResolvedValue({
+      id: 1,
+      ownerId: 100,
+      isPublic: true,
+    });
+
+    const result = await service.findOne(1, 42);
+    expect(result).toBeDefined();
+  });
+
+  it.each([
+    {
+      name: 'update',
+      action: () => service.update(1, {} as any, 42),
+    },
+    {
+      name: 'remove',
+      action: () => service.remove(1, 42),
+    },
+    {
+      name: 'shareWithUser',
+      action: () => service.shareWithUser(1, 42, 'someuser'),
+    },
+    {
+      name: 'unshareWithUser',
+      action: () => service.unshareWithUser(1, 42, 'someuser'),
+    },
+    {
+      name: 'setVisibility',
+      action: () => service.setVisibility(1, 42, true),
+    },
+    {
+      name: 'addIngredient',
+      action: () => service.addIngredient(1, { productId: 1, quantity: 100 } as any, 42),
+    },
+    {
+      name: 'updateImage',
+      action: () => service.updateImage(1, 'http://example.com/image.jpg', 42),
+    },
+  ])('%s nekar icke-owner', async ({ action }) => {
+    setRecipeAsOwnedByAnotherUser();
+
+    await expect(action()).rejects.toThrow(NotFoundException);
+  });
+});
diff --git a/backend/src/recipes/recipes.security.spec.ts b/backend/src/recipes/recipes.security.spec.ts
new file mode 100644
index 00000000..96cd0d5d
--- /dev/null
+++ b/backend/src/recipes/recipes.security.spec.ts
@@ -0,0 +1,100 @@
+import { UnauthorizedException } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { JwtAuthGuard } from '../auth/jwt-auth.guard';
+import { RecipesController } from './recipes.controller';
+
+describe('Recipes controller security', () => {
+  const makeUser = (overrides: Partial<{ userId: number; role: string }> = {}) => ({
+    userId: 42,
+    role: 'user',
+    ...overrides,
+  });
+
+  const recipesServiceMock = {
+    findAll: jest.fn(),
+    findOne: jest.fn(),
+    create: jest.fn(),
+    update: jest.fn(),
+    remove: jest.fn(),
+    shareWithUser: jest.fn(),
+    unshareWithUser: jest.fn(),
+    setVisibility: jest.fn(),
+  };
+
+  const controller = new RecipesController(recipesServiceMock as any, {} as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('JwtAuthGuard kräver autentisering på findAll', () => {
+    const guard = new JwtAuthGuard(new Reflector());
+
+    expect(() => guard.handleRequest(null, null, null)).toThrow(UnauthorizedException);
+  });
+
+  it('JwtAuthGuard tillåter autentiserad användare på findAll', () => {
+    const guard = new JwtAuthGuard(new Reflector());
+    const user = makeUser({ userId: 1 });
+
+    expect(guard.handleRequest(null, user, null)).toBe(user);
+  });
+
+  it('findOne vidarebefordrar @CurrentUser.userId till service', () => {
+    recipesServiceMock.findOne.mockResolvedValue({ id: 1 });
+
+    controller.findOne(1, makeUser());
+
+    expect(recipesServiceMock.findOne).toHaveBeenCalledWith(1, 42);
+  });
+
+  it('create vidarebefordrar @CurrentUser.userId till service', async () => {
+    const dto = { name: 'test' };
+    recipesServiceMock.create.mockResolvedValue({ id: 1 });
+
+    await controller.create(dto as any, makeUser());
+
+    expect(recipesServiceMock.create).toHaveBeenCalledWith(dto, 42);
+  });
+
+  it('update vidarebefordrar @CurrentUser.userId till service', async () => {
+    const dto = { name: 'updated' };
+    recipesServiceMock.update.mockResolvedValue({ id: 1 });
+
+    await controller.update(1, dto as any, makeUser());
+
+    expect(recipesServiceMock.update).toHaveBeenCalledWith(1, dto, 42);
+  });
+
+  it('remove vidarebefordrar @CurrentUser.userId till service', async () => {
+    recipesServiceMock.remove.mockResolvedValue(undefined);
+
+    await controller.remove(1, makeUser());
+
+    expect(recipesServiceMock.remove).toHaveBeenCalledWith(1, 42);
+  });
+
+  it('shareRecipe vidarebefordrar userId och trimmar username', async () => {
+    recipesServiceMock.shareWithUser.mockResolvedValue(undefined);
+
+    await controller.shareRecipe(1, { username: '  alice  ' } as any, makeUser());
+
+    expect(recipesServiceMock.shareWithUser).toHaveBeenCalledWith(1, 42, 'alice');
+  });
+
+  it('unshareRecipe vidarebefordrar userId och trimmar username', async () => {
+    recipesServiceMock.unshareWithUser.mockResolvedValue(undefined);
+
+    await controller.unshareRecipe(1, '  alice  ', makeUser());
+
+    expect(recipesServiceMock.unshareWithUser).toHaveBeenCalledWith(1, 42, 'alice');
+  });
+
+  it('setVisibility vidarebefordrar userId till service', async () => {
+    recipesServiceMock.setVisibility.mockResolvedValue(undefined);
+
+    await controller.setVisibility(1, { isPublic: true } as any, makeUser());
+
+    expect(recipesServiceMock.setVisibility).toHaveBeenCalledWith(1, 42, true);
+  });
+});
diff --git a/backend/src/test-utils/security-test-helpers.ts b/backend/src/test-utils/security-test-helpers.ts
new file mode 100644
index 00000000..44a8d706
--- /dev/null
+++ b/backend/src/test-utils/security-test-helpers.ts
@@ -0,0 +1,26 @@
+import { ExecutionContext } from '@nestjs/common';
+import { ROLES_KEY } from '../auth/decorators/roles.decorator';
+
+export type MockHttpContextOptions = {
+  handler: Function;
+  clazz: Function;
+  user?: unknown;
+};
+
+export type AdminHandler = [string, Function];
+
+export function mockHttpContext(options: MockHttpContextOptions): ExecutionContext {
+  return {
+    getClass: () => options.clazz,
+    getHandler: () => options.handler,
+    switchToHttp: () => ({
+      getRequest: () => ({ user: options.user }),
+      getResponse: () => ({}),
+      getNext: () => undefined,
+    }),
+  } as unknown as ExecutionContext;
+}
+
+export function getRolesMetadata(handler: Function): string[] | undefined {
+  return Reflect.getMetadata(ROLES_KEY, handler) as string[] | undefined;
+}
diff --git a/backend/src/users/users.security.spec.ts b/backend/src/users/users.security.spec.ts
new file mode 100644
index 00000000..0e43a4a1
--- /dev/null
+++ b/backend/src/users/users.security.spec.ts
@@ -0,0 +1,101 @@
+import { BadRequestException } from '@nestjs/common';
+import { UsersController } from './users.controller';
+import { getRolesMetadata } from '../test-utils/security-test-helpers';
+
+describe('Users controller security', () => {
+  const usersServiceMock = {
+    findById: jest.fn(),
+    updateProfile: jest.fn(),
+    setRole: jest.fn(),
+    deleteUser: jest.fn(),
+    resetPassword: jest.fn(),
+    updateEmail: jest.fn(),
+  };
+
+  const controller = new UsersController(usersServiceMock as any);
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('alla admin-endpoints har @Roles("admin") metadata', () => {
+    for (const [, handler] of [
+      ['listUsers', UsersController.prototype.listUsers],
+      ['setRole', UsersController.prototype.setRole],
+      ['setPremium', UsersController.prototype.setPremium],
+      ['setRecipeSharing', UsersController.prototype.setRecipeSharing],
+      ['setAiEngineEnabled', UsersController.prototype.setAiEngineEnabled],
+      ['adminCreateUser', UsersController.prototype.adminCreateUser],
+      ['deleteUser', UsersController.prototype.deleteUser],
+      ['resetPassword', UsersController.prototype.resetPassword],
+      ['updateEmail', UsersController.prototype.updateEmail],
+    ]) {
+      expect(getRolesMetadata(handler as Function)).toEqual(['admin']);
+    }
+  });
+
+  it('getMe scopear till @CurrentUser.userId', async () => {
+    usersServiceMock.findById.mockResolvedValue({
+      id: 42,
+      username: 'alice',
+      email: 'a@example.com',
+      firstName: 'Alice',
+      lastName: 'Doe',
+      role: 'user',
+    });
+
+    const result = await controller.getMe({ userId: 42, username: 'alice' });
+
+    expect(usersServiceMock.findById).toHaveBeenCalledWith(42);
+    expect(result).toEqual(
+      expect.objectContaining({
+        id: 42,
+        username: 'alice',
+        role: 'user',
+      }),
+    );
+  });
+
+  it('updateMe scopear till @CurrentUser.userId', async () => {
+    const dto = { firstName: 'New' };
+    usersServiceMock.updateProfile.mockResolvedValue({
+      id: 42,
+      username: 'alice',
+      email: 'a@example.com',
+      firstName: 'New',
+      lastName: 'Doe',
+    });
+
+    await controller.updateMe({ userId: 42, username: 'alice' }, dto);
+
+    expect(usersServiceMock.updateProfile).toHaveBeenCalledWith(42, dto);
+  });
+
+  it('setRole nekar att ändra sin egen roll', async () => {
+    await expect(
+      controller.setRole(42, { userId: 42, username: 'alice', role: 'admin' }, { role: 'user' } as any),
+    ).rejects.toThrow(BadRequestException);
+
+    expect(usersServiceMock.setRole).not.toHaveBeenCalled();
+  });
+
+  it('deleteUser nekar att ta bort eget konto', async () => {
+    await expect(controller.deleteUser(42, { userId: 42 })).rejects.toThrow(BadRequestException);
+
+    expect(usersServiceMock.deleteUser).not.toHaveBeenCalled();
+  });
+
+  it('resetPassword nekar self-reset via adminendpoint', async () => {
+    await expect(controller.resetPassword(42, { userId: 42 })).rejects.toThrow(BadRequestException);
+
+    expect(usersServiceMock.resetPassword).not.toHaveBeenCalled();
+  });
+
+  it('updateEmail nekar egen e-poständring via adminendpoint', async () => {
+    await expect(controller.updateEmail(42, { userId: 42 }, { email: 'new@example.com' } as any)).rejects.toThrow(
+      BadRequestException,
+    );
+
+    expect(usersServiceMock.updateEmail).not.toHaveBeenCalled();
+  });
+});