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CVE-2026-30618 is an unauthenticated remote code execution vulnerability in xszyou Fay 4.3.1, also referred to as the Fay Digital Human Framework. The flaw resides in MCP STDIO server management and command execution handling exposed through the MCP management interface. An attacker who can reach this interface can configure an MCP STDIO server using attacker-controlled command values and parameters. Because these values are executed by the application without sufficient restriction or sanitization, arbitrary operating system commands can be launched on the underlying host. Successful exploitation results in command execution in the security context of the Fay service.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Fay Framework tied to unsafe MCP STDIO defaults that can enable command injection or remote command execution.
A critical unauthenticated remote command execution vulnerability in Fay Digital Human Framework caused by unsanitized STDIO MCP configuration input.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.