CVE-2026-30618
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductFay
PublishedJul 15, 2026
First seenJul 15, 2026
Weakness typeCWE-94Code injection
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| xszyou Fay | 4.3.1 | — |
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