{"id":"CVE-2026-12773","aliases":["EUVD-2026-38139","GHSA-4jcj-7x88-m979","PYSEC-2026-4067"],"status":"published","title":"BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication","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.","severity":{"version":"4.0","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/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01017,"percentile":0.63738,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287","CWE-303"],"published":"2026-06-21T03:15:08Z","modified":"2026-10-28T02:30:27Z","fixes":[{"ecosystem":"PyPI","package":"litellm","fixed_in":["1.84.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"litellm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.84.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"litellm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.84.0"}]}],"versions":["0.1.0","0.1.1","0.1.2","0.1.201","0.1.202","0.1.203","0.1.204","0.1.205","0.1.206","0.1.207","0.1.208","0.1.209","0.1.210","0.1.211","0.1.212","0.1.213","0.1.214","0.1.215","0.1.216","0.1.217","0.1.218","0.1.219","0.1.220","0.1.221","0.1.222","0.1.223","0.1.224","0.1.225","0.1.226","0.1.227","0.1.228","0.1.229","0.1.2291","0.1.230","0.1.231","0.1.232","0.1.233","0.1.234","0.1.235","0.1.236","0.1.237","0.1.238","0.1.3","0.1.31","0.1.32","0.1.330","0.1.331","0.1.34","0.1.341","0.1.343","0.1.345","0.1.347","0.1.348","0.1.349","0.1.351","0.1.352","0.1.353","0.1.354","0.1.356","0.1.360","0.1.361","0.1.362","0.1.363","0.1.364","0.1.365","0.1.366","0.1.367","0.1.368","0.1.369","0.1.370","0.1.371","0.1.372","0.1.373","0.1.375","0.1.376","0.1.379","0.1.380","0.1.381","0.1.383","0.1.384","0.1.385","0.1.386","0.1.387","0.1.388","0.1.389","0.1.392","0.1.393","0.1.394","0.1.398","0.1.399","0.1.400","0.1.401","0.1.402","0.1.403","0.1.404","0.1.405","0.1.410","0.1.411","0.1.412","0.1.415","0.1.419","0.1.420","0.1.421","0.1.422","0.1.424","0.1.425","0.1.426","0.1.429","0.1.433","0.1.434","0.1.435","0.1.436","0.1.437","0.1.438","0.1.439","0.1.440","0.1.441","0.1.442","0.1.443","0.1.444","0.1.445","0.1.446","0.1.447","0.1.448","0.1.449","0.1.450","0.1.451","0.1.452","0.1.456","0.1.457","0.1.459","0.1.460","0.1.461","0.1.464","0.1.465","0.1.475","0.1.477","0.1.479","0.1.480","0.1.481","0.1.482","0.1.486","0.1.487","0.1.488","0.1.490","0.1.491","0.1.492","0.1.493","0.1.494","0.1.495","0.1.497","0.1.500","0.1.501","0.1.504","0.1.507","0.1.508","0.1.509","0.1.510","0.1.511","0.1.512","0.1.516","0.1.517","0.1.518","0.1.520","0.1.525","0.1.530","0.1.531","0.1.533","0.1.535","0.1.536","0.1.537","0.1.538","0.1.544","0.1.546","0.1.547","0.1.548","0.1.549","0.1.550","0.1.551","0.1.552","0.1.553","0.1.554","0.1.555","0.1.556","0.1.557","0.1.558","0.1.559","0.1.560","0.1.561","0.1.562","0.1.563","0.1.567","0.1.568","0.1.569","0.1.570","0.1.574","0.1.578","0.1.580","0.1.582","0.1.583","0.1.585","0.1.586","0.1.587","0.1.590","0.1.591","0.1.593","0.1.595","0.1.596","0.1.597","0.1.598","0.1.600","0.1.601","0.1.604","0.1.605","0.1.607","0.1.609","0.1.610","0.1.615","0.1.618","0.1.619","0.1.620","0.1.621","0.1.623","0.1.624","0.1.625","0.1.626","0.1.629","0.1.630","0.1.631","0.1.632","0.1.634","0.1.635","0.1.636","0.1.638","0.1.639","0.1.641","0.1.642","0.1.643","0.1.644","0.1.645","0.1.646","0.1.647","0.1.648","0.1.649","0.1.650","0.1.651","0.1.652","0.1.674","0.1.680","0.1.681","0.1.683","0.1.685","0.1.686","0.1.687","0.1.689","0.1.690","0.1.692","0.1.693","0.1.696","0.1.697","0.1.698","0.1.700","0.1.700.dev0","0.1.700.dev1","0.1.700.dev2","0.1.700.dev3","0.1.700.dev4","0.1.700.dev5","0.1.702","0.1.704","0.1.706","0.1.714","0.1.714.dev1","0.1.715","0.1.716","0.1.719","0.1.720","0.1.721","0.1.723","0.1.724","0.1.729","0.1.736","0.1.738","0.1.743","0.1.745","0.1.746","0.1.747","0.1.748","0.1.749","0.1.750","0.1.751","0.1.758","0.1.765","0.1.769","0.1.7701","0.1.7713","0.1.772","0.1.774","0.1.780","0.1.781","0.1.784","0.1.786","0.1.788","0.1.789","0.1.793","0.1.794","0.1.805","0.1.806","0.1.807","0.1.813","0.1.814","0.1.815","0.1.816","0.1.817","0.1.818","0.1.819","0.1.820","0.1.821","0.1.824","0.10.0","0.10.1","0.11.1","0.12.10","0.12.11","0.12.12","0.12.4","0.12.4.dev1","0.12.4.dev2","0.12.5","0.12.5.dev1","0.12.7","0.12.7.dev1","0.12.8","0.12.9","0.13.0","0.13.1","0.13.1.dev1","0.13.1.dev2","0.13.1.dev3","0.13.2","0.13.2.dev1","0.13.3.dev1","0.13.3.dev2","0.13.6.dev1","0.13.6.dev2","0.13.6.dev3","0.13.7.dev1","0.14.0","0.14.0.dev1","0.14.1","0.2.5","0.2.6","0.3.0","0.3.1","0.4.0","0.4.4","0.5.2","0.5.3","0.5.4","0.5.6","0.6.0","0.6.1","0.6.2","0.6.6","0.7.1","0.7.1.dev1","0.7.1.dev2","0.7.1.dev3","0.7.10","0.7.3","0.7.4","0.7.5","0.7.9","0.8.0","0.8.1","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.9.0","0.9.1","0.9.2","0.9.2.dev1","1.0.0","1.0.0.dev1","1.0.3","1.0.3.dev1","1.1.0","1.1.1","1.1.2","1.1.3","1.10.0","1.10.1","1.10.10","1.10.11","1.10.2","1.10.3","1.10.4","1.10.6","1.10.8","1.10.9","1.10.dev11","1.11.0","1.11.1","1.12.0","1.12.1","1.12.2","1.12.3","1.12.5","1.12.5.dev1","1.12.6.dev1","1.12.6.d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hat","product":"exploit intelligence"},{"vendor":"red hat","product":"red hat ansible automation platform 2"},{"vendor":"red hat","product":"red hat openshift ai (rhoai)"}],"references":[{"url":"https://vuldb.com/vuln/372515","tags":["vdb-entry","technical-description","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://vuldb.com/vuln/372515/cti","tags":["signature","permissions-required","Permissions Required","VDB Entry","report","web"]},{"url":"https://vuldb.com/cve/CVE-2026-12773","tags":["third-party-advisory","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://vuldb.com/submit/811282","tags":["third-party-advisory","exploit","Exploit","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e","tags":["exploit","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-12773","tags":["vdb-entry","x_refsource_REDHAT","advisory","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491112","tags":["issue-tracking","x_refsource_REDHAT","report","web"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json","tags":["x_sadp-csaf-vex","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12773","tags":["advisory"]},{"url":"https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c","tags":["web"]},{"url":"https://github.com/advisories/GHSA-4jcj-7x88-m979","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12773.json","tags":["advisory"]},{"url":"https://github.com/BerriAI/litellm","tags":["package"]},{"url":"https://pypi.org/project/litellm","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-12773","title":"BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication","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.","status":"published","published":"2026-06-21T03:15:08.647Z","modified":"2026-07-15T01:22:10.736Z","cvss":[{"version":"4.0","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/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":7.3,"vector":"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","level":"high","assessor":"cna"},{"version":"3.0","score":7.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R","level":"high","assessor":"cna"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR","assessor":"cna"},{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"adp"}],"cwes":["CWE-287","CWE-303"],"updated_at":"2026-11-02T14:19:47.998488Z"}],"euvd":[{"id":"EUVD-2026-38139","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.","status":"published","published":"2026-06-21T03:15:08Z","modified":"2026-07-15T01:22:10Z","cvss":[{"version":"4.0","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/E:P","level":"medium"}],"updated_at":"2026-11-02T18:19:55.318488Z"}],"ghsa":[{"id":"GHSA-4jcj-7x88-m979","title":"LiteLLM: MCP Proxy Has Improper Authentication","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.","status":"published","published":"2026-06-21T06:32:07Z","modified":"2026-09-10T22:32:03Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"},{"version":"4.0","score":5.5,"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","level":"medium"}],"cwes":["CWE-287","CWE-303"],"updated_at":"2026-11-02T14:41:15.803194Z"}],"nvd":[{"id":"CVE-2026-12773","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.","status":"published","published":"2026-06-21T04:16:28.23Z","modified":"2026-10-25T23:10:00.167Z","cvss":[{"version":"4.0","score":5.5,"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"secondary"}],"cwes":["CWE-287","CWE-303"],"updated_at":"2026-11-02T14:12:24.912854Z"}],"osv":[{"id":"CVE-2026-12773","title":"BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication","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.","status":"published","published":"2026-06-21T03:15:08.647Z","modified":"2026-10-28T02:30:27.291012592Z","cvss":[{"version":"4.0","score":5.5,"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","level":"medium"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:44:57.354194Z"},{"id":"GHSA-4jcj-7x88-m979","title":"LiteLLM: MCP Proxy Has Improper Authentication","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.","status":"published","published":"2026-06-21T06:32:07Z","modified":"2026-10-01T17:55:39.243118326Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"},{"version":"4.0","score":5.5,"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","level":"medium"}],"cwes":["CWE-287","CWE-303"],"updated_at":"2026-11-02T15:46:37.148947Z"},{"id":"PYSEC-2026-4067","title":"LiteLLM: MCP Proxy Has Improper Authentication","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.","status":"published","published":"2026-10-01T16:38:27.207433Z","modified":"2026-10-01T17:45:04.682994395Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"},{"version":"4.0","score":5.5,"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","level":"medium"}],"updated_at":"2026-11-02T15:52:57.255153Z"}]}}