CVE-2026-63178 PUBLISHED

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.

• https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m
• https://github.com/onyx-dot-app/onyx/pull/12525
• https://github.com/onyx-dot-app/onyx/pull/12549
• https://github.com/onyx-dot-app/onyx/commit/46e19cc2750fed659488cb12a1f171016ba5a099
• https://github.com/onyx-dot-app/onyx/commit/b9e1c6894be3c237283f4b5fd4eb0af935b40664
• https://github.com/onyx-dot-app/onyx/releases/tag/v4.3.0

• CWE-639: Authorization Bypass Through User-Controlled Key CWE