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9.8

FC United theme allows unauthenticated code execution

CVE-2026-66565 · published 5 days ago
Summary

The FC United WordPress theme (versions up to 1.1.1) can be tricked by anyone on the internet to run its own code on your site. This could let an attacker take control of the website or steal information. Update the theme to a newer version or switch to a different theme as soon as possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
axiomthemes fc united <= 1.1.1
Original advisory text
WordPress FC United theme <= 1.1.1 - PHP Object Injection vulnerability
Unauthenticated PHP Object Injection in FC United <= 1.1.1 versions.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-502Deserialization of Untrusted Data
Timeline
Published10 Oct 2026
Updated15 Oct 2026
First seen10 Oct 2026
Sources
CVE-2026-66565 · NVD
CVE-2026-66565 · MITRE
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