{"cve":"CVE-2026-12773","nvd":{"published":"2026-06-21T04:16:28.230","modified":"2026-10-25T23:10:00.167","status":"Modified","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_v4":{"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/E:P","score":5.5},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-287","CWE-303"],"references":["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"],"products":["litellm:litellm"],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-12773","score":0.01017,"percentile":0.63074,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-4jcj-7x88-m979","url":"https://osv.dev/vulnerability/GHSA-4jcj-7x88-m979","summary":"LiteLLM: MCP Proxy Has Improper Authentication","modified":"2026-10-01T17:55:39.243118326Z","packages":[{"ecosystem":"PyPI","name":"litellm","purl":"pkg:pypi/litellm","ranges":["<1.84.0"],"fixed":["1.84.0"]}]},{"id":"PYSEC-2026-4067","url":"https://osv.dev/vulnerability/PYSEC-2026-4067","summary":"LiteLLM: MCP Proxy Has Improper Authentication","modified":"2026-10-01T17:45:04.682994395Z","packages":[{"ecosystem":"PyPI","name":"litellm","purl":"pkg:pypi/litellm","ranges":["<1.84.0"],"fixed":["1.84.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}