diff --git a/backend/open_webui/apps/webui/routers/knowledge.py b/backend/open_webui/apps/webui/routers/knowledge.py
index 55bb1316d..dfe233372 100644
--- a/backend/open_webui/apps/webui/routers/knowledge.py
+++ b/backend/open_webui/apps/webui/routers/knowledge.py
@@ -17,6 +17,9 @@ from open_webui.apps.retrieval.main import process_file, ProcessFileForm
 
 from open_webui.constants import ERROR_MESSAGES
 from open_webui.utils.utils import get_admin_user, get_verified_user
+from open_webui.utils.access_control import has_access
+
+
 from open_webui.env import SRC_LOG_LEVELS
 
 
@@ -154,13 +157,20 @@ async def get_knowledge_by_id(id: str, user=Depends(get_verified_user)):
     knowledge = Knowledges.get_knowledge_by_id(id=id)
 
     if knowledge:
-        file_ids = knowledge.data.get("file_ids", []) if knowledge.data else []
-        files = Files.get_files_by_ids(file_ids)
 
-        return KnowledgeFilesResponse(
-            **knowledge.model_dump(),
-            files=files,
-        )
+        if (
+            user.role == "admin"
+            or knowledge.user_id == user.id
+            or has_access(user.id, "read", knowledge.access_control)
+        ):
+
+            file_ids = knowledge.data.get("file_ids", []) if knowledge.data else []
+            files = Files.get_files_by_ids(file_ids)
+
+            return KnowledgeFilesResponse(
+                **knowledge.model_dump(),
+                files=files,
+            )
     else:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
@@ -179,8 +189,20 @@ async def update_knowledge_by_id(
     form_data: KnowledgeUpdateForm,
     user=Depends(get_verified_user),
 ):
-    knowledge = Knowledges.update_knowledge_by_id(id=id, form_data=form_data)
+    knowledge = Knowledges.get_knowledge_by_id(id=id)
+    if not knowledge:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.NOT_FOUND,
+        )
 
+    if knowledge.user_id != user.id and user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
+        )
+
+    knowledge = Knowledges.update_knowledge_by_id(id=id, form_data=form_data)
     if knowledge:
         file_ids = knowledge.data.get("file_ids", []) if knowledge.data else []
         files = Files.get_files_by_ids(file_ids)
@@ -212,6 +234,19 @@ def add_file_to_knowledge_by_id(
     user=Depends(get_verified_user),
 ):
     knowledge = Knowledges.get_knowledge_by_id(id=id)
+
+    if not knowledge:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.NOT_FOUND,
+        )
+
+    if knowledge.user_id != user.id and user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
+        )
+
     file = Files.get_file_by_id(form_data.file_id)
     if not file:
         raise HTTPException(
@@ -277,6 +312,18 @@ def update_file_from_knowledge_by_id(
     user=Depends(get_verified_user),
 ):
     knowledge = Knowledges.get_knowledge_by_id(id=id)
+    if not knowledge:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.NOT_FOUND,
+        )
+
+    if knowledge.user_id != user.id and user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
+        )
+
     file = Files.get_file_by_id(form_data.file_id)
     if not file:
         raise HTTPException(
@@ -327,6 +374,18 @@ def remove_file_from_knowledge_by_id(
     user=Depends(get_verified_user),
 ):
     knowledge = Knowledges.get_knowledge_by_id(id=id)
+    if not knowledge:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.NOT_FOUND,
+        )
+
+    if knowledge.user_id != user.id and user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
+        )
+
     file = Files.get_file_by_id(form_data.file_id)
     if not file:
         raise HTTPException(
@@ -382,13 +441,55 @@ def remove_file_from_knowledge_by_id(
         )
 
 
+############################
+# DeleteKnowledgeById
+############################
+
+
+@router.delete("/{id}/delete", response_model=bool)
+async def delete_knowledge_by_id(id: str, user=Depends(get_verified_user)):
+    knowledge = Knowledges.get_knowledge_by_id(id=id)
+    if not knowledge:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.NOT_FOUND,
+        )
+
+    if knowledge.user_id != user.id and user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
+        )
+
+    try:
+        VECTOR_DB_CLIENT.delete_collection(collection_name=id)
+    except Exception as e:
+        log.debug(e)
+        pass
+    result = Knowledges.delete_knowledge_by_id(id=id)
+    return result
+
+
 ############################
 # ResetKnowledgeById
 ############################
 
 
 @router.post("/{id}/reset", response_model=Optional[KnowledgeResponse])
-async def reset_knowledge_by_id(id: str, user=Depends(get_admin_user)):
+async def reset_knowledge_by_id(id: str, user=Depends(get_verified_user)):
+    knowledge = Knowledges.get_knowledge_by_id(id=id)
+    if not knowledge:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.NOT_FOUND,
+        )
+
+    if knowledge.user_id != user.id and user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
+        )
+
     try:
         VECTOR_DB_CLIENT.delete_collection(collection_name=id)
     except Exception as e:
@@ -399,19 +500,3 @@ async def reset_knowledge_by_id(id: str, user=Depends(get_admin_user)):
         id=id, form_data=KnowledgeUpdateForm(data={"file_ids": []})
     )
     return knowledge
-
-
-############################
-# DeleteKnowledgeById
-############################
-
-
-@router.delete("/{id}/delete", response_model=bool)
-async def delete_knowledge_by_id(id: str, user=Depends(get_verified_user)):
-    try:
-        VECTOR_DB_CLIENT.delete_collection(collection_name=id)
-    except Exception as e:
-        log.debug(e)
-        pass
-    result = Knowledges.delete_knowledge_by_id(id=id)
-    return result