Weak Authentication Vulnerability in LiteLLM by OXsecurity
CVE-2026-93355

7.6HIGH

Key Information:

Vendor

Berriai

Status
Litellm
Vendor
CVE Published:
28 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-93355?

LiteLLM is impacted by a vulnerability that permits attackers to utilize a valid JSON Web Token (JWT) from a designated identity provider to impersonate any existing user. The flaw arises from an email-based fallback lookup process in the authentication flow which bypasses verification of the email_verified claim. Malicious actors can exploit this vulnerability by presenting a token with an unverified email address corresponding to a victim’s account, thereby gaining access to the victim’s privileges, including proxy_admin rights. This compromises the integrity of user identities, enabling attackers to maintain persistent unauthorized access to sensitive administrative endpoints and potentially exposing critical API keys and user management capabilities.

Affected Version(s)

litellm 0 <= 1.102.1

litellm 0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-93355 - Proof of Concept

References

https://www.ox.security/blog/litellm-an-ordinary-login-to...
technical-descriptionexploit
https://www.vulncheck.com/advisories/litellm-weak-jwt-aut...
third-party-advisory

CVSS V4

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • đź‘ľ

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nir Zadok (Nirza) and Moshe Siman Tov Bustan of OXsecurity
.