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High severity8.0NVD Advisory· Published Jun 25, 2026· Updated Jun 29, 2026

CVE-2026-54030

CVE-2026-54030

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.

Affected products

3
  • Librechat/Librechat3 versions
    cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*range: <=0.8.4
    • cpe:2.3:a:librechat:librechat:0.8.5:rc1:*:*:*:*:*:*
    • (no CPE)range: <0.8.5

Patches

Vulnerability mechanics

References

1

News mentions

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