— Unscored

BerriAI LiteLLM Improper Authentication Vulnerability

CVE-2026-59822 Exploited

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.

Being exploited in the wild

Catalogued 2 September 2026 · US federal remediation deadline 16 September 2026

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…

Exploit code is also public: Public PoC

Public PoCHORKimhab/CVE-2026-59822

Part of the AI stack

This affects LiteLLM, in Inference & serving.

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Yes — listed in the CISA KEV catalog
Exploit availability: CISA KEV, Public PoC
Published: 2 September 2026
Last updated: 2 September 2026
Affected: BerriAI · LiteLLM
Weakness: CWE-287, CWE-306

At the source

CISA KEV

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

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Query this programmatically

Agents can read this through the MCP endpoint, or over HTTP:

curl https://cve.zerocrew.in/api/cve/CVE-2026-59822