PT-2026-52494 · Danny Avila · Librechat
Published
2026-06-25
·
Updated
2026-06-25
·
CVE-2026-54030
CVSS v3.1
8.0
High
| Vector | AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N |
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.
Fix
Origin Validation Error
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Weakness Enumeration
Related Identifiers
Affected Products
Librechat