CVE-2026-76073 Label Studio through 1.23.0 Cross-Organization Annotation Access via Unscoped AnnotationAPI Queryset
Authenticated users can access, modify, or delete annotations from other organizations due to missing object-level authorization checks in the API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-76073?
CVE-2026-76073 is a high-severity missing authorization vulnerability in HumanSignal label-studio, published on 24 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Label Studio does not scope the annotation detail endpoint to the requesting user's organization. AnnotationAPI in label_studio/tasks/api.py declares queryset = Annotation.objects.all() and provides no get_queryset override, so the default lookup retrieves any annotation by primary key. The view's permission_required entries name annotations.view, annotations.change and annotations.delete, and label_studio/core/permissions.py registers every permission with rules.is_authenticated, so the check is satisfied by any logged-in account and no object-level organization test runs. The sibling task endpoint does constrain its queryset with project__organization set to the requester's active organization, which is the boundary this path omits. Annotation identifiers are sequential integers, so an authenticated user of one organization can enumerate identifiers to read, modify and delete annotations belonging to other organizations on the same instance. The same unscoped queryset appears on AnnotationConvertAPI in the same file.
Weakness: CWE-639
Which versions are affected by CVE-2026-76073?
How do I fix CVE-2026-76073?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-76073 being exploited?
There is no known exploitation of CVE-2026-76073 in the wild and no public exploit code.
Sources
Also known as GHSA-f3mm-hmc7-j4qg, MINI-9386-984x-c7x7.