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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.