CVE-2026-93355: LiteLLM Weak JWT Authentication via Email-Based User Lookup
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 emailverified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxyadmin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.
Affected Software
Event History
Frequently Asked Questions
Is a JWT from an arbitrary identity provider sufficient to exploit this issue?
No. The attacker needs a valid JWT issued by the identity provider configured for the LiteLLM deployment.
Does exploitation require user interaction or an existing administrative account?
No user interaction is required. The CVSS vector indicates low privileges are required, and a matching existing user account can be targeted to inherit that user's role, including proxy_admin.
What makes the unauthorized access persistent?
Successful exploitation can permanently overwrite the victim's stored identity binding. This can allow the attacker to retain access as that user after the initial impersonation.