{"id":"CVE-2026-93355","aliases":["EUVD-2026-88462","GHSA-g83g-3c4g-cfm5","openSUSE-SU-2026:11927-1"],"status":"published","title":"LiteLLM Weak JWT Authentication via Email-Based User Lookup","description":"LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.","severity":{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00273,"percentile":0.19886,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-1390"],"published":"2026-09-28T19:26:01Z","modified":"2026-10-28T02:30:37Z","exploits":[{"source":"pocgithub","id":"InertFluid/cve-2026-93355-lab","title":"InertFluid/cve-2026-93355-lab","date":"2026-10-07","url":"https://github.com/InertFluid/cve-2026-93355-lab"}],"affected":[{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-litellm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.103.0-1.1"}]}],"bundled":2}],"products":[{"vendor":"berriai","product":"litellm"}],"references":[{"url":"https://www.ox.security/blog/litellm-an-ordinary-login-token-can-become-someone-elses-admin-account/","tags":["technical-description","exploit","evidence"]},{"url":"https://www.vulncheck.com/advisories/litellm-weak-jwt-authentication-via-email-based-user-lookup","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93355","tags":["advisory"]},{"url":"https://www.ox.security/blog/litellm-an-ordinary-login-token-can-become-someone-elses-admin-account"},{"url":"https://github.com/advisories/GHSA-g83g-3c4g-cfm5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93355.json","tags":["advisory"]},{"url":"https://github.com/BerriAI/litellm","tags":["package"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-89032","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93355","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-93355","title":"LiteLLM Weak JWT Authentication via Email-Based User Lookup","description":"LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.","status":"published","published":"2026-09-28T19:26:01.155Z","modified":"2026-10-01T15:21:59.696Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T14:19:54.122945Z"}],"euvd":[{"id":"EUVD-2026-88462","description":"LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.","status":"published","published":"2026-09-28T19:26:01Z","modified":"2026-10-01T15:21:59Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:44.672309Z"}],"ghsa":[{"id":"GHSA-g83g-3c4g-cfm5","title":"LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT...","description":"LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.","status":"published","published":"2026-09-28T21:31:18Z","modified":"2026-09-28T21:31:26Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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":"high"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T15:12:32.639211Z"}],"nvd":[{"id":"CVE-2026-93355","description":"LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.","status":"published","published":"2026-09-28T20:17:11.547Z","modified":"2026-09-30T17:23:08.953Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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":"high","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T14:12:52.413234Z"}],"osv":[{"id":"CVE-2026-93355","title":"LiteLLM Weak JWT Authentication via Email-Based User Lookup","description":"LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.","status":"published","published":"2026-09-28T19:26:01.155Z","modified":"2026-10-28T02:30:37.624364773Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T15:45:20.931171Z"},{"id":"openSUSE-SU-2026:11927-1","title":"python313-litellm-1.103.0-1.1 on GA media","description":"These are all security issues fixed in the python313-litellm-1.103.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-29T00:00:00Z","modified":"2026-09-30T18:23:14.885353897Z","updated_at":"2026-11-02T16:58:40.245664Z"}]}}