by Kastro
Paper/Archive/CVE-2026-30618

CVE-2026-30618

mitre — xszyou Fay 4.3.1 contains a remote code execution vulnerability in its MCP STDIO server management and command execution handling.

EPSS 1%CVSS 9.8
critical.is priorityof 100
43
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 68.1.681 × 2013.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
n/an/a–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystemrefgithub.com/xszyou/Fay