berriai/litellm · Security
LiteLLM: MCP Proxy Has Improper Authentication
- GHSA ID
- GHSA-4jcj-7x88-m979
- CVE ID
- CVE-2026-12773
- Severity
- medium
- Published
- Updated
- CVSS
- 7.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- CVSS v3
- 7.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- CVSS v4
- 5.5 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
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.
CWEs
- CWE-287 · Improper Authentication
- CWE-303 · Incorrect Implementation of Authentication Algorithm
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-12773 ↗
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e ↗
- https://vuldb.com/cve/CVE-2026-12773 ↗
- https://vuldb.com/submit/811282 ↗
- https://vuldb.com/vuln/372515 ↗
- https://vuldb.com/vuln/372515/cti ↗
- https://access.redhat.com/security/cve/CVE-2026-12773 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2491112 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json ↗
- https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c ↗
- https://github.com/advisories/GHSA-4jcj-7x88-m979 ↗