CVE-2026-54030 - Vulnerability Details - OpenCVE

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to steal access tokens intended for a legitimate server. This vulnerability is fixed in 0.8.5.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact total

Vendors	Products
Danny-avila	Libre Chat

No data.

No data.

References

Link	Providers
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23

History

Fri, 26 Jun 2026 02:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Thu, 25 Jun 2026 21:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Danny-avila Danny-avila libre Chat
Vendors & Products		Danny-avila Danny-avila libre Chat

Thu, 25 Jun 2026 16:45:00 +0000

Type	Values Removed	Values Added
Description		LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to steal access tokens intended for a legitimate server. This vulnerability is fixed in 0.8.5.
Title		LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
Weaknesses		CWE-346
References		https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23
Metrics		cvssV3_1 `{'score': 8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N'}`

MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-06-25T15:48:00.480Z

Updated: 2026-06-26T02:04:54.939Z

Reserved: 2026-06-11T16:57:50.018Z

Link: CVE-2026-54030

Vulnrichment

Updated: 2026-06-26T02:04:48.924Z

NVD

No data.

Redhat

No data.

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