CVE-2026-63178
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
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | onyx-dot-app |
| Product | onyx |
| Published | Aug 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
onyx-dot-app / onyx
< 4.3.0
References
github.com: https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m github.com: https://github.com/onyx-dot-app/onyx/pull/12525 github.com: https://github.com/onyx-dot-app/onyx/pull/12549 github.com: https://github.com/onyx-dot-app/onyx/commit/46e19cc2750fed659488cb12a1f171016ba5a099 github.com: https://github.com/onyx-dot-app/onyx/commit/b9e1c6894be3c237283f4b5fd4eb0af935b40664 github.com: https://github.com/onyx-dot-app/onyx/releases/tag/v4.3.0