LibreChat is a ChatGPT clone with additional features.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Mar 27, 2026 · NIST NVD

   Detected

   LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP (Model Context Protocol) servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containing (and others), causing victims who call tools on that server to have their OAuth tokens exfiltrated.

2. Jun 17, 2026 · NIST NVD

   Updated

   LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP (Model Context Protocol) servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containing (and others), causing victims who call tools on that server to have their OAuth tokens exfiltrated.

Affected

• cpe librechat/librechatversion unspecified
• cpe librechat/librechat0.8.3

Sources

• CVE.orgVulnerability recordCVE-2026-31951

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-31951

  LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP (Model Context Protocol) servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server wit

  nvd.nist.gov

References

• Exploit · github.com