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CVE

CVE-2026-71424

Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers
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CVE

CVE-2026-71424

Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers

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/{personaid} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.settokens and OnyxTokenStorage.setclientinfo in backend/onyx/server/features/mcp/api.py copy per-user tokens into a shared admin MCPConnectionConfig row and dbmcpservertoapimcpserver returns that row through authtemplate.headers to any BASIC_ACCESS user. This issue is fixed in versions 3.1.10, 3.2.14, and 4.0.0.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71424.json, https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822, https://nvd.nist.gov/vuln/detail/CVE-2026-71424, 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

Severity

9.6

CVSS Score
0
10

Basic Information

Base CVSS
9.6
EPSS Probability
0.00291%
EPSS Percentile
0.21122%
Introduced Version
634cb0b07a4c00ebd9ea4a5f2ad2112e1a85cd20
Fix Available
b103937888fd5008067c2bb6eb6e5424576394f2

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