Vulnerability · Published Sep 28, 2026 · Assigned by VulnCheck

CVE-2026-93355LiteLLM Weak JWT Authentication via Email-Based User Lookup

High 8.1

In plain English

A high-severity security flaw in litellm from BerriAI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.3%top 80.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

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.

Affected products (as reported)

Vendor	Product	Versions
BerriAI	litellm	0 – through 1.102.10 – through f4308bc124eebc783dfc51790ce8db27ed21ae00

Weakness: CWE-1390 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

OXsecurity Blog technical-description, exploit
https://www.vulncheck.com/advisories/litellm-weak-jwt-authentication-via-email-based-user-lookup third-party-advisory