CVE-2026-12773
BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication
CVSS Score
7.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | berriai |
| Product | litellm |
| Published | Jun 21, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
BerriAI / litellm
1.59.0 1.59.1 1.59.2 1.59.3 1.59.4 1.59.5 1.59.6 1.59.7 1.59.8
References
vuldb.com: https://vuldb.com/vuln/372515 vuldb.com: https://vuldb.com/vuln/372515/cti vuldb.com: https://vuldb.com/cve/CVE-2026-12773 vuldb.com: https://vuldb.com/submit/811282 gist.github.com: https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-12773 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2491112 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json
Credits
🔍 Eric-c (VulDB User) VulDB CNA Team