CVE-2026-30618

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

xszyou Fay 4.3.1 contains a remote code execution vulnerability in its MCP STDIO server management and command execution handling. A remote attacker can access the publicly exposed MCP management interface and configure an MCP STDIO server with attacker-controlled commands and parameters, resulting in execution of arbitrary commands on the server. Successful exploitation allows arbitrary command execution within the context of the Fay service.

Published 2026-07-15. Last modified 2026-07-16.