CVE-2026-63178 Missing authorization in onyx
Curators can modify arbitrary user group memberships to gain unauthorized access to documents due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63178?
CVE-2026-63178 is a medium-severity missing authorization vulnerability in onyx-dot-app onyx, published on 17 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Onyx is an open-source AI platform. Prior to 4.3.0, Onyx Enterprise Edition's PATCH /manage/admin/user-group/{user_group_id} and POST /manage/admin/user-group/{user_group_id}/add-users endpoints in ee/onyx/server/user_group/api.py call update_user_group and add_users_to_user_group in ee/onyx/db/user_group.py without enforcing _validate_curator_can_modify_group, allowing a curator to add accounts to arbitrary groups and obtain document access through get_acl_for_user and the OpenSearch access_control_list filter. This issue is fixed in version 4.3.0.
Weakness: CWE-639
Which versions are affected by CVE-2026-63178?
How do I fix CVE-2026-63178?
No fix has been published for CVE-2026-63178 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-63178 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63178 exists.
Sources
Also known as GHSA-7f48-vgpj-h95m.