Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Litellm | Litellm | < 1.59.9 |
Related Weaknesses (CWE)
References
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309eExploitThird Party Advisory
- https://vuldb.com/cve/CVE-2026-12773Third Party AdvisoryVDB Entry
- https://vuldb.com/submit/811282ExploitThird Party AdvisoryVDB Entry
- https://vuldb.com/vuln/372515Third Party AdvisoryVDB Entry
- https://vuldb.com/vuln/372515/ctiPermissions RequiredVDB Entry
- 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://vuldb.com/submit/811282ExploitThird Party AdvisoryVDB Entry
FAQ
What is CVE-2026-12773?
CVE-2026-12773 is a vulnerability with a CVSS score of 7.3 (HIGH). 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 componen...
How severe is CVE-2026-12773?
CVE-2026-12773 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-12773?
Check the references section above for vendor advisories and patch information. Affected products include: Litellm Litellm.