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Vulnerability record · CVE-2026-30618 · published 15 July 2026

CVE-2026-30618: Code injection vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 1.2% · top 33.1% CWE-94 · Code injection Deferred
9.8CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
16 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/xszyou/Fay
https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/

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Source: NIST National Vulnerability Database (record CVE-2026-30618), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.