CVE WatchSep 3, 2026

CVE-2026-59822

BerriAI LiteLLM Improper Authentication Vulnerability

CVSS

8.2

High

EPSS

0.8%

p57

KEV

YES

Sep 2, 2026

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Sep 3, 2026 · CWE-287 · CWE-306

EPSS · 30d

0.8%EPSS · 30 days0.9%

2026-09-192026-10-17

KEV catalog record

Product

BerriAI / LiteLLM

Vulnerability

BerriAI LiteLLM Improper Authentication Vulnerability

Added to KEV

Sep 2, 2026

Remediate by

Sep 16, 2026

Known ransomware use

Summary description

BerriAI LiteLLM contains an improper authentication vulnerability in the MCP Streamable HTTP endpoint that could allow an unauthenticated attacker to establish an authenticated MCP session using an arbitrary Bearer token.

Required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Notes

https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-59822

Technical description

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.

Official references

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