CVE-2026-12773

medium

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

https://vuldb.com/vuln/372515

https://vuldb.com/cve/CVE-2026-12773

https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e

https://vuldb.com/vuln/372515/cti

https://vuldb.com/submit/811282

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json

https://bugzilla.redhat.com/show_bug.cgi?id=2491112

https://access.redhat.com/security/cve/CVE-2026-12773

Details

Source: Mitre, NVD

Published: 2026-06-21

Updated: 2026-07-15

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 6.9

Vector: 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

Severity: Medium

EPSS

EPSS: 0.00391