diff --git a/apps/server/src/modules/authorization-rules/rules/task.rule.spec.ts b/apps/server/src/modules/authorization-rules/rules/task.rule.spec.ts
index 844c11ceeec..37bf29fb2a3 100644
--- a/apps/server/src/modules/authorization-rules/rules/task.rule.spec.ts
+++ b/apps/server/src/modules/authorization-rules/rules/task.rule.spec.ts
@@ -146,6 +146,29 @@ describe('TaskRule', () => {
 			});
 		});
 
+		describe('when task has no course or lesson', () => {
+			const setup = () => {
+				const role = roleFactory.build({ permissions: [permissionA, permissionB], name: RoleName.TEACHER });
+				const creator = userFactory.build({ roles: [role] });
+				const otherUser = userFactory.build({ roles: [role] });
+				const task = taskFactory.build({ creator });
+
+				return { role, creator, otherUser, task };
+			};
+
+			it('creator should have access to task', () => {
+				const { creator, task } = setup();
+				const res = service.hasPermission(creator, task, { action: Action.read, requiredPermissions: [] });
+				expect(res).toBe(true);
+			});
+
+			it('otherUser should not have access to task', () => {
+				const { otherUser, task } = setup();
+				const res = service.hasPermission(otherUser, task, { action: Action.read, requiredPermissions: [] });
+				expect(res).toBe(false);
+			});
+		});
+
 		describe('when user is student and is task creator with Permission A,B', () => {
 			const setup = () => {
 				const role = roleFactory.build({ permissions: [permissionA, permissionB], name: RoleName.STUDENT });
diff --git a/apps/server/src/modules/authorization-rules/rules/task.rule.ts b/apps/server/src/modules/authorization-rules/rules/task.rule.ts
index dbe7650d8b8..704d71e2b1a 100644
--- a/apps/server/src/modules/authorization-rules/rules/task.rule.ts
+++ b/apps/server/src/modules/authorization-rules/rules/task.rule.ts
@@ -64,6 +64,6 @@ export class TaskRule implements Rule<Task> {
 
 			return hasCoursePermission;
 		}
-		return true;
+		return false;
 	}
 }
diff --git a/apps/server/src/modules/task/controller/api-test/task-delete.api.spec.ts b/apps/server/src/modules/task/controller/api-test/task-delete.api.spec.ts
index f4b12cf9616..538ca3a5230 100644
--- a/apps/server/src/modules/task/controller/api-test/task-delete.api.spec.ts
+++ b/apps/server/src/modules/task/controller/api-test/task-delete.api.spec.ts
@@ -56,24 +56,24 @@ describe('Task Controller (API)', () => {
 	});
 
 	describe('[DELETE] :taskId', () => {
-		const setup = async () => {
-			const teacher = createTeacher();
-			const student = createStudent();
-			const course = courseFactory.build({
-				teachers: [teacher.user],
-				students: [student.user],
-			});
-			const task = taskFactory.isPublished().build({ course });
+		describe('when logged in as a teacher', () => {
+			const setup = async () => {
+				const teacher = createTeacher();
+				const student = createStudent();
+				const course = courseFactory.build({
+					teachers: [teacher.user],
+					students: [student.user],
+				});
+				const task = taskFactory.isPublished().build({ course });
 
-			await em.persistAndFlush([teacher.user, teacher.account, student.user, student.account, task]);
-			em.clear();
+				await em.persistAndFlush([teacher.user, teacher.account, student.user, student.account, task]);
+				em.clear();
 
-			const teacherClient = await testApiClient.login(teacher.account);
+				const teacherClient = await testApiClient.login(teacher.account);
 
-			return { teacherClient, teacher, student, course, task };
-		};
+				return { teacherClient, teacher, student, course, task };
+			};
 
-		describe('when logged in as a teacher', () => {
 			it('should return status 200 for valid task', async () => {
 				const { teacherClient, task } = await setup();
 
@@ -82,5 +82,39 @@ describe('Task Controller (API)', () => {
 				expect(response.status).toEqual(200);
 			});
 		});
+
+		describe('when logged in as another teacher', () => {
+			const setup = async () => {
+				const teacher = createTeacher();
+				const anotherTeacher = createTeacher();
+
+				const task = taskFactory.isPublished().build();
+
+				await em.persistAndFlush([teacher.user, teacher.account, anotherTeacher.user, anotherTeacher.account, task]);
+				em.clear();
+
+				const anotherTeacherClient = await testApiClient.login(anotherTeacher.account);
+
+				return { anotherTeacherClient, anotherTeacher, task };
+			};
+
+			it('should return status 403 for valid task', async () => {
+				const { anotherTeacherClient, task } = await setup();
+
+				const response = await anotherTeacherClient.delete(`${task.id}`);
+
+				expect(response.status).toEqual(403);
+			});
+
+			it('should not actually delete the task', async () => {
+				const { anotherTeacherClient, task } = await setup();
+
+				await anotherTeacherClient.delete(`${task.id}`);
+
+				const taskAfterDelete = await em.findOneOrFail('Task', task.id);
+
+				expect(taskAfterDelete).toBeDefined();
+			});
+		});
 	});
 });