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CVE-2026-59822 (GCVE-0-2026-59822)

Vulnerability from cvelistv5 – Published: 2026-07-08 19:32 – Updated: 2026-09-03 03:56
VLAI CISA Previdian
Title
LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback
Summary
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.
Severity
8.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 00:00 UTC
CWE
  • CWE-287 - Improper Authentication
  • CWE-306 - Missing Authentication for Critical Function
Assigner
References
Impacted products
Vendor Product Version CPE status
BerriAI litellm Affected: < 1.84.0
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b2e0c044-08c5-41bb-baab-bb5cd2619d20

Vulnerability ID: CVE-2026-59822

Status: Confirmed

Status Updated: 2026-09-02 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-02
Asserted: 2026-09-02
Scope
Notes: BerriAI LiteLLM Improper Authentication Vulnerability | Affected: BerriAI / LiteLLM | 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. | Due date: 2026-09-16 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287 CWE-306
Feed CISA Known Exploited Vulnerabilities Catalog
Product LiteLLM
Due Date 2026-09-16
Date Added 2026-09-02
Vendorproject BerriAI
Vulnerabilityname BerriAI LiteLLM Improper Authentication Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-09-02 18:00 UTC | Updated: 2026-09-02 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1cb21f7a-02be-413e-88ea-fb6775aeabde

Vulnerability ID: CVE-2026-59822

Status: Confirmed

Status Updated: 2026-09-02 17:31 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-02
Asserted: 2026-09-02
Scope
Notes: LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback | Affected: BerriAI / litellm | CVSS: 8.8 (HIGH) | EPSS: 0.00516 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback
Vendor BerriAI
Product litellm
Added Date 2026-09-02T17:31:01.269Z
Cvss Score 8.8
Epss Score 0.00516
Cvss Severity HIGH
Epss Percentile 0.41918
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-09-03 18:00 UTC | Updated: 2026-09-03 18:00 UTC
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.