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Vulnerability record · CVE-2026-71424 · published 17 August 2026

CVE-2026-71424: Information exposure vulnerability

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.

9.6 CVSS 3.1 Critical EPSS 0.49% · top 60.4% CWE-200 · Information exposureCWE-863 · Incorrect authorization Deferred
9.6CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
18 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

LinkTags
https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e
https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910
https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2
https://github.com/onyx-dot-app/onyx/pull/11238
https://github.com/onyx-dot-app/onyx/pull/11242
https://github.com/onyx-dot-app/onyx/pull/11243
https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0
https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822

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Source: NIST National Vulnerability Database (record CVE-2026-71424), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.