CVE-2026-63178: CWE-639: Authorization Bypass Through User-Controlled Key in onyx-dot-app onyx
Onyx Enterprise Edition versions prior to 4.3.0 contain an authorization bypass vulnerability in specific user group management endpoints. This flaw allows a curator to add accounts to arbitrary user groups without proper validation, potentially granting unauthorized document access. The issue is resolved in version 4.3.0.
AI Analysis
Technical Summary
CVE-2026-63178 describes an authorization bypass vulnerability (CWE-639) in Onyx Enterprise Edition before version 4.3.0. The PATCH /manage/admin/user-group/{user_group_id} and POST /manage/admin/user-group/{user_group_id}/add-users endpoints call functions to update user groups without enforcing the _validate_curator_can_modify_group check. This allows a curator to add users to arbitrary groups, thereby gaining document access via get_acl_for_user and the OpenSearch access_control_list filter. The vulnerability is fixed in version 4.3.0.
Potential Impact
An attacker with curator privileges can bypass authorization controls to add users to arbitrary groups, resulting in unauthorized access to documents. This compromises confidentiality and integrity but does not affect availability. The CVSS 3.1 base score is 6.5 (medium severity), reflecting network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, and high impact on confidentiality and integrity.
Mitigation Recommendations
Upgrade Onyx Enterprise Edition to version 4.3.0 or later, where the vulnerability is fixed by enforcing proper authorization checks. No other mitigation is indicated or required.
CVE-2026-63178: CWE-639: Authorization Bypass Through User-Controlled Key in onyx-dot-app onyx
Description
Onyx Enterprise Edition versions prior to 4.3.0 contain an authorization bypass vulnerability in specific user group management endpoints. This flaw allows a curator to add accounts to arbitrary user groups without proper validation, potentially granting unauthorized document access. The issue is resolved in version 4.3.0.
CVSS v3.1
Score 6.5medium
Affected software
onyx-dot-app
onyx
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-63178 describes an authorization bypass vulnerability (CWE-639) in Onyx Enterprise Edition before version 4.3.0. The PATCH /manage/admin/user-group/{user_group_id} and POST /manage/admin/user-group/{user_group_id}/add-users endpoints call functions to update user groups without enforcing the _validate_curator_can_modify_group check. This allows a curator to add users to arbitrary groups, thereby gaining document access via get_acl_for_user and the OpenSearch access_control_list filter. The vulnerability is fixed in version 4.3.0.
Potential Impact
An attacker with curator privileges can bypass authorization controls to add users to arbitrary groups, resulting in unauthorized access to documents. This compromises confidentiality and integrity but does not affect availability. The CVSS 3.1 base score is 6.5 (medium severity), reflecting network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, and high impact on confidentiality and integrity.
Mitigation Recommendations
Upgrade Onyx Enterprise Edition to version 4.3.0 or later, where the vulnerability is fixed by enforcing proper authorization checks. No other mitigation is indicated or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-15T22:13:00.720Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a838032bf8831d5399e4770
Added to database: 08/17/2026, 21:42:10 UTC
Last enriched: 09/12/2026, 00:32:30 UTC
Last updated: 10/02/2026, 02:46:05 UTC
Views: 58
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