Authorization bypass in onyx-dot-app onyx
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| onyx-dot-app | onyx | before 4.3.0 | 4.3.0 | Patch available | CNA |
- onyx Vendoronyx-dot-app Affected before 4.3.0 Fixed in 4.3.0 Patch available CNA
Remediation
- Fix · CNA onyx (onyx-dot-app) Fixed in 4.3.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-63178
References
Other 6
- 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
More onyx-dot-app vulnerabilities
- TI-2026-58811 Onyx 4.6.6 Custom Tool Secret Header Disclosure via Tool Endpoints CVSS 4.0HIGH 7.1
- TI-2026-50048 Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers CVSS 3.1CRITICAL 9.6
- TI-2026-80125 Cross-site scripting in onyx-dot-app Onyx PreviewTab.tsx CVSS 4.0MEDIUM 5.1
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences