diff --git a/backend/src/middleware/auth/checks/question-checks.ts b/backend/src/middleware/auth/checks/question-checks.ts
index 63b47e7b..bfe76061 100644
--- a/backend/src/middleware/auth/checks/question-checks.ts
+++ b/backend/src/middleware/auth/checks/question-checks.ts
@@ -6,6 +6,7 @@ import {getLearningObjectId, getQuestionId} from "../../../controllers/questions
 import {fetchQuestion} from "../../../services/questions";
 import {FALLBACK_SEQ_NUM} from "../../../config";
 import {fetchAnswer} from "../../../services/answers";
+import {mapToUsername} from "../../../interfaces/user";
 
 export const onlyAllowAuthor = authorize(
     (auth: AuthenticationInfo, req: AuthenticatedRequest) => req.body.author === auth.username
@@ -46,3 +47,26 @@ export const onlyAllowAuthorRequestAnswer = authorize(
         return answer.author.username == auth.username;
     }
 );
+
+export const onlyAllowIfHasAccessToQuestion = authorize(
+    async (auth, req) => {
+        const hruid = req.params.hruid;
+        const version = req.params.version;
+        const language = req.query.lang as string;
+        const seq = req.params.seq;
+        requireFields({ hruid });
+
+        const learningObjectId = getLearningObjectId(hruid, version, language);
+        const questionId = getQuestionId(learningObjectId, seq);
+
+        const question = await fetchQuestion(questionId);
+        const group = question.inGroup;
+
+        if (auth.accountType === "teacher") {
+            const cls = group.assignment.within; // TODO check if contains full objects
+            return cls.teachers.map(mapToUsername).includes(auth.username);
+        } else { // user is student
+            return group.members.map(mapToUsername).includes(auth.username);
+        }
+    }
+);
diff --git a/backend/src/routes/answers.ts b/backend/src/routes/answers.ts
index 0f11c173..2571c56d 100644
--- a/backend/src/routes/answers.ts
+++ b/backend/src/routes/answers.ts
@@ -1,7 +1,11 @@
 import express from 'express';
 import { createAnswerHandler, deleteAnswerHandler, getAnswerHandler, getAllAnswersHandler, updateAnswerHandler } from '../controllers/answers.js';
 import {adminOnly, authenticatedOnly, teachersOnly} from "../middleware/auth/checks/auth-checks";
-import {onlyAllowAuthor, onlyAllowAuthorRequestAnswer} from "../middleware/auth/checks/question-checks";
+import {
+    onlyAllowAuthor,
+    onlyAllowAuthorRequestAnswer,
+    onlyAllowIfHasAccessToQuestion
+} from "../middleware/auth/checks/question-checks";
 
 
 const router = express.Router({ mergeParams: true });
@@ -10,7 +14,7 @@ router.get('/', adminOnly, getAllAnswersHandler);
 
 router.post('/', teachersOnly, onlyAllowAuthor, createAnswerHandler);
 
-router.get('/:seqAnswer', authenticatedOnly, getAnswerHandler);
+router.get('/:seqAnswer', onlyAllowIfHasAccessToQuestion, getAnswerHandler);
 
 router.delete('/:seqAnswer', teachersOnly, onlyAllowAuthorRequestAnswer, deleteAnswerHandler);
 
diff --git a/backend/src/routes/questions.ts b/backend/src/routes/questions.ts
index 287a242b..1363ae1a 100644
--- a/backend/src/routes/questions.ts
+++ b/backend/src/routes/questions.ts
@@ -3,7 +3,11 @@ import { createQuestionHandler, deleteQuestionHandler, getAllQuestionsHandler, g
 import answerRoutes from './answers.js';
 import {adminOnly, authenticatedOnly, studentsOnly} from "../middleware/auth/checks/auth-checks";
 import {updateAnswerHandler} from "../controllers/answers";
-import {onlyAllowAuthor, onlyAllowAuthorRequest} from "../middleware/auth/checks/question-checks";
+import {
+    onlyAllowAuthor,
+    onlyAllowAuthorRequest,
+    onlyAllowIfHasAccessToQuestion
+} from "../middleware/auth/checks/question-checks";
 
 const router = express.Router({ mergeParams: true });
 
@@ -15,7 +19,7 @@ router.get('/', adminOnly, getAllQuestionsHandler);
 router.post('/', studentsOnly, onlyAllowAuthor, createQuestionHandler);
 
 // Information about a question with id
-router.get('/:seq', authenticatedOnly, getQuestionHandler); // TODO every body in group + teachers?
+router.get('/:seq', onlyAllowIfHasAccessToQuestion, getQuestionHandler);
 
 router.delete('/:seq', studentsOnly, onlyAllowAuthorRequest, deleteQuestionHandler);
 
diff --git a/backend/src/services/questions.ts b/backend/src/services/questions.ts
index 49bf9e92..38f12689 100644
--- a/backend/src/services/questions.ts
+++ b/backend/src/services/questions.ts
@@ -12,6 +12,7 @@ import { AssignmentDTO } from '@dwengo-1/common/interfaces/assignment';
 import { fetchStudent } from './students.js';
 import { NotFoundException } from '../exceptions/not-found-exception';
 import { FALLBACK_VERSION_NUM } from '../config.js';
+import {ConflictException} from "../exceptions/conflict-exception";
 
 export async function getQuestionsAboutLearningObjectInAssignment(
     loId: LearningObjectIdentifier,
@@ -88,12 +89,20 @@ export async function createQuestion(loId: LearningObjectIdentifier, questionDat
 
     const clazz = await getClassRepository().findById((questionData.inGroup.assignment as AssignmentDTO).within);
     const assignment = mapToAssignment(questionData.inGroup.assignment as AssignmentDTO, clazz!);
-    const inGroup = await getGroupRepository().findByAssignmentAndGroupNumber(assignment, questionData.inGroup.groupNumber);
+    const group = await getGroupRepository().findByAssignmentAndGroupNumber(assignment, questionData.inGroup.groupNumber);
+
+    if (!group){
+        throw new NotFoundException("Group with id and assignment not found");
+    }
+
+    if (! group.members.contains(author)) {
+        throw new ConflictException("Author is not part of this group");
+    }
 
     const question = await questionRepository.createQuestion({
         loId,
         author,
-        inGroup: inGroup!,
+        inGroup: group!,
         content,
     });