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.
References7
- github.com/onyx-dot-app/onyx/commit/46e19cc2750fed659488cb12a1f…
- github.com/onyx-dot-app/onyx/commit/b9e1c6894be3c237283f4b5fd4e…
- github.com/onyx-dot-app/onyx/pull/12525
- github.com/onyx-dot-app/onyx/pull/12549
- github.com/onyx-dot-app/onyx/releases/tag/v4.3.0
- github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj…
- github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj…
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 1% percentile: 44 · as of 11 November 2026
- CWE
- CWE-639
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.