What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-30
• Weakness: CWE-1390

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

• BerriAI litellm: through 1.102.1

References

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

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