LiteLLM: MCP Proxy Has Improper Authentication
GHSA-4jcj-7x88-m979 · CVE-2026-12773
Published · Modified
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Description
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.
References
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-12773
- WEB https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c
- WEB https://access.redhat.com/security/cve/CVE-2026-12773
- WEB https://bugzilla.redhat.com/show_bug.cgi?id=2491112
- WEB https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e
- PACKAGE https://github.com/BerriAI/litellm
- WEB https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json
- WEB https://vuldb.com/cve/CVE-2026-12773
- WEB https://vuldb.com/submit/811282
- WEB https://vuldb.com/vuln/372515
- WEB https://vuldb.com/vuln/372515/cti
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