CVE-2026-63178CWE-639

CVE-2026-63178

Medium · published August 18, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
43.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00516 · 43.1th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-08-18T02:17Z
References (7)
https://github.com/onyx-dot-app/onyx/commit/46e19cc2750fed659488cb12a1f171016ba5a099 · [email protected]https://github.com/onyx-dot-app/onyx/commit/b9e1c6894be3c237283f4b5fd4eb0af935b40664 · [email protected]https://github.com/onyx-dot-app/onyx/pull/12525 · [email protected]https://github.com/onyx-dot-app/onyx/pull/12549 · [email protected]https://github.com/onyx-dot-app/onyx/releases/tag/v4.3.0 · [email protected]https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m · [email protected]https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 AUG 21:30Z
    Onyx Curator-scope IDOR: any curator can modify membership of arbitrary user groups via unscoped PATCH /manage/admin/user-group/{id} and /add-users leading to cross-group document disclosure
    cvelistv5