CVE-2026-59822: BerriAI LiteLLM Improper Authentication Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- BerriAI LiteLLM contains an improper authentication vulnerability in the MCP Streamable HTTP endpoint allowing unauthenticated attackers to establish authenticated sessions with arbitrary Bearer tokens.
- Who is affected
- Deployments of BerriAI LiteLLM exposing the MCP Streamable HTTP endpoint without proper token validation.
- Urgency
- Critical; actively exploited and bypasses authentication entirely for MCP session establishment.
- Action
- Update BerriAI LiteLLM to a patched version and implement Bearer token validation in the MCP endpoint.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-59822
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-59822Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 42% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-59822 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploitedCISA Adds Seven Known Exploited Vulnerabilities to Catalogcisa
- highGHSA-7488-6r32-c95q: LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallbackghsa
- high[NEW] [high] LiteLLM: Multiple vulnerabilitiescert-bund
- highCVE-2026-59822: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to…nvd
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