Vulnerability in Berriai Litellm
CVE-2026-93355
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.
Published .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.ox.security/blog/litellm-an-ordinary-login-token-can-become-someone-elses-a… (technical-description, exploit)
- www.vulncheck.com/advisories/litellm-weak-jwt-authentication-via-email-based-us… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93355?
- CVE-2026-93355 is a high-severity vulnerability in Berriai Litellm, classified under Weak Authentication. CVSS score: 8.1/10. Published 2026-09-28.
- How severe is CVE-2026-93355?
- High severity. CVSS v3 base score is 8.1 out of 10.