Vulnerability in BerriAI litellm

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund28 Sep 2026WID-SEC-2026-3617

  LiteLLM: Vulnerability allows bypassing security measures and potentially privilege escalation Translated from German

  CVE-2026-93355

[ References ]References

• www.ox.security/blog/litellm-an-ordinary-login-token-can-become-someone-elses-admin-acc…
• www.vulncheck.com/advisories/litellm-weak-jwt-authentication-via-email-based-user-lookup