onyx-dot-app Onyx up to 3.1.9/3.2.13/3.x MCP API api.py OnyxTokenStorage.set_tokens improper authorization

Summaryinfo

A vulnerability was found in onyx-dot-app Onyx up to 3.1.9/3.2.13/3.x. It has been rated as problematic. Affected is the function OnyxTokenStorage.set_tokens of the file backend/onyx/server/features/mcp/api.py of the component MCP API. This manipulation causes improper authorization. The identification of this vulnerability is CVE-2026-71424. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in onyx-dot-app Onyx up to 3.1.9/3.2.13/3.x. It has been declared as problematic. Affected by this vulnerability is the function OnyxTokenStorage.set_tokens of the file backend/onyx/server/features/mcp/api.py of the component MCP API. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. The summary by CVE is:

Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx's GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.set_tokens and OnyxTokenStorage.set_client_info in backend/onyx/server/features/mcp/api.py copy per-user tokens into a shared admin MCPConnectionConfig row and _db_mcp_server_to_api_mcp_server returns that row through auth_template.headers to any BASIC_ACCESS user. This issue is fixed in versions 3.1.10, 3.2.14, and 4.0.0.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-71424 since 08/06/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 3.1.10, 3.2.14 or 4.0.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• onyx-dot-app

Name

• Onyx

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 3.2.4
• 3.2.5
• 3.2.6
• 3.2.7
• 3.2.8
• 3.2.9
• 3.2.10
• 3.2.11
• 3.2.12
• 3.2.13
• 3.x

Website

• Product: https://github.com/onyx-dot-app/onyx/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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