Bug 2491112 (CVE-2026-12773) - CVE-2026-12773 litellm: BerriAI litellm: Improper authentication in MCP Proxy via UserAPIKeyAuth function
Summary: CVE-2026-12773 litellm: BerriAI litellm: Improper authentication in MCP Proxy...
Keywords:
Status: NEW
Alias: CVE-2026-12773
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-21 04:01 UTC by OSIDB Bzimport
Modified: 2026-06-26 09:25 UTC (History)
16 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-06-21 04:01:13 UTC 
A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure.
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