diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index a9f99d04..21cd6473 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -2162,13 +2162,12 @@ class DocumentAskForAccessViewSet(
         serializer = serializers.RoleSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
 
-        document = self.get_document_or_404()
-        user_role = document.get_role(request.user)
-        target_role = serializer.validated_data.get("role")
+        target_role = serializer.validated_data.get(
+            "role", document_ask_for_access.role
+        )
+        abilities = document_ask_for_access.get_abilities(request.user)
 
-        if models.RoleChoices.get_priority(user_role) < models.RoleChoices.get_priority(
-            target_role
-        ):
+        if target_role not in abilities["set_role_to"]:
             return drf.response.Response(
                 {"detail": "You cannot accept a role higher than your own."},
                 status=drf.status.HTTP_400_BAD_REQUEST,
diff --git a/src/backend/core/models.py b/src/backend/core/models.py
index 6e0ad69e..7a93b82c 100644
--- a/src/backend/core/models.py
+++ b/src/backend/core/models.py
@@ -1205,23 +1205,14 @@ class DocumentAskForAccess(BaseModel):
 
     def get_abilities(self, user):
         """Compute and return abilities for a given user."""
-        roles = []
+        user_role = self.document.get_role(user)
+        is_admin_or_owner = user_role in PRIVILEGED_ROLES
 
-        if user.is_authenticated:
-            teams = user.teams
-            try:
-                roles = self.user_roles or []
-            except AttributeError:
-                try:
-                    roles = self.document.accesses.filter(
-                        models.Q(user=user) | models.Q(team__in=teams),
-                    ).values_list("role", flat=True)
-                except (self._meta.model.DoesNotExist, IndexError):
-                    roles = []
-
-        is_admin_or_owner = bool(
-            set(roles).intersection({RoleChoices.OWNER, RoleChoices.ADMIN})
-        )
+        set_role_to = [
+            role
+            for role in RoleChoices.values
+            if RoleChoices.get_priority(role) <= RoleChoices.get_priority(user_role)
+        ]
 
         return {
             "destroy": is_admin_or_owner,
@@ -1229,6 +1220,7 @@ class DocumentAskForAccess(BaseModel):
             "partial_update": is_admin_or_owner,
             "retrieve": is_admin_or_owner,
             "accept": is_admin_or_owner,
+            "set_role_to": set_role_to,
         }
 
     def accept(self, role=None):
diff --git a/src/backend/core/tests/documents/test_api_documents_ask_for_access.py b/src/backend/core/tests/documents/test_api_documents_ask_for_access.py
index e566ff14..2d93b753 100644
--- a/src/backend/core/tests/documents/test_api_documents_ask_for_access.py
+++ b/src/backend/core/tests/documents/test_api_documents_ask_for_access.py
@@ -287,6 +287,7 @@ def test_api_documents_ask_for_access_list_authenticated_own_request():
                     "update": False,
                     "partial_update": False,
                     "retrieve": False,
+                    "set_role_to": [],
                 },
             }
         ],
@@ -356,6 +357,15 @@ def test_api_documents_ask_for_access_list_owner_or_admin(role):
 
     response = client.get(f"/api/v1.0/documents/{document.id}/ask-for-access/")
     assert response.status_code == 200
+
+    expected_set_role_to = [
+        RoleChoices.READER,
+        RoleChoices.EDITOR,
+        RoleChoices.ADMIN,
+    ]
+    if role == RoleChoices.OWNER:
+        expected_set_role_to.append(RoleChoices.OWNER)
+
     assert response.json() == {
         "count": 3,
         "next": None,
@@ -375,6 +385,7 @@ def test_api_documents_ask_for_access_list_owner_or_admin(role):
                     "update": True,
                     "partial_update": True,
                     "retrieve": True,
+                    "set_role_to": expected_set_role_to,
                 },
             }
             for document_ask_for_access in document_ask_for_accesses
@@ -467,6 +478,13 @@ def test_api_documents_ask_for_access_retrieve_owner_or_admin(role):
         f"/api/v1.0/documents/{document.id}/ask-for-access/{document_ask_for_access.id}/"
     )
     assert response.status_code == 200
+    expected_set_role_to = [
+        RoleChoices.READER,
+        RoleChoices.EDITOR,
+        RoleChoices.ADMIN,
+    ]
+    if role == RoleChoices.OWNER:
+        expected_set_role_to.append(RoleChoices.OWNER)
     assert response.json() == {
         "id": str(document_ask_for_access.id),
         "document": str(document.id),
@@ -481,6 +499,7 @@ def test_api_documents_ask_for_access_retrieve_owner_or_admin(role):
             "update": True,
             "partial_update": True,
             "retrieve": True,
+            "set_role_to": expected_set_role_to,
         },
     }