Vulnerability · Published Oct 10, 2026 · Assigned by Patchstack
CVE-2026-66565WordPress FC United theme <= 1.1.1 - PHP Object Injection vulnerability
Critical 9.8
In plain English
A critical-severity unsafe deserialization in FC United from axiomthemes. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.3%top 76.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Unauthenticated PHP Object Injection in FC United <= 1.1.1 versions.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| axiomthemes | FC United | n/a – through 1.1.1 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H