CVE-2026-66565CWE-502insecure-deserialization

CVE-2026-66565

Critical · published October 11, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
23.0
In the wild
Unconfirmed
What it is

Unauthenticated PHP Object Injection in FC United <= 1.1.1 versions.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00313 · 23.0th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-10-11T00:16Z
References (1)
https://patchstack.com/database/wordpress/theme/fcunited/vulnerability/wordpress-fc-united-theme-1-1-1-php-object-injection-vulnerability?_s_id=cve · [email protected]
EPSS history
Timeline
  • 12 OCT 03:30Z
    EPSS moved — → 0%
    epss
  • 10 OCT 19:36Z
    WordPress FC United theme <= 1.1.1 - PHP Object Injection vulnerability
    cvelistv5
  • 10 OCT 19:36Z
    WordPress FC United theme <= 1.1.1 - PHP Object Injection vulnerability
    cvelistv5