Vulnerability · Published Jun 16, 2026 · Assigned by Patchstack
CVE-2026-12256WordPress Fusion Builder plugin <= 3.15.3 - PHP Object Injection vulnerability
High 8.8
In plain English
A high-severity unsafe deserialization in Fusion Builder from ThemeFusion. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.5%top 59.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Deserialization of Untrusted Data vulnerability in ThemeFusion Fusion Builder fusion-builder allows Object Injection.This issue affects Fusion Builder: from n/a through 3.15.3.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ThemeFusion | Fusion Builder | 0 – through 3.15.3 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H