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VulnerabilityPublished Updated

CVE-2026-30618: Fay · Code Injection

Affects FaySource CVE Database V5

0

Not known to be exploited · CVSS 9.8 Critical.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
1.1% chance of exploitation in 30 days – higher than 67% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
GitHubxszyou/Faypkg:github/xszyou/FayOther threatsAffected
  • =4.3.1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until an official fix is available, restrict access to the MCP management interface to trusted networks only and monitor for unauthorized access attempts. Avoid exposing the MCP management interface publicly.

Description

xszyou Fay version 4.3.1 contains a critical remote code execution vulnerability in its MCP STDIO server management interface. An unauthenticated remote attacker can exploit this flaw by accessing the publicly exposed MCP management interface and configuring the MCP STDIO server with attacker-controlled commands and parameters. This leads to arbitrary command execution within the context of the Fay service, potentially compromising the affected system.

References

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