CVE-2026-54030: 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…

PriorityP354critical9.3CVSS 3.1

AVNACLPRNUIRSCCHIHAN

EPSS

0.11%

1.7th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
danny-avila	librechat	< 0.8.5	0.8.5
librechat	librechat	<= 0.8.4	—
librechat	librechat	—	—

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