What the vulnerability does
01Description
The Fluent Forms Pro Add On Pack plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.2.6 via deserialization of untrusted input. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a PHP Object. The additional presence of a POP chain allows attackers to change user passwords and potentially take over administrator accounts. Note: This can only be exploited if user update integration is enabled and a user meta field is mapped.
Explanation of Vulnerability in Simple Terms
02Summary
Fluent Forms Pro Add On Pack versions up to 6.2.6 contain a deserialization vulnerability that allows authenticated users to execute arbitrary PHP code on the site. An attacker with low-level access can craft malicious serialized data to trigger code execution. This affects all installations running the vulnerable version range.
What an attacker can do
03Attacker Capabilities
Run arbitrary PHP code on the site and take full control of it.
Potential impact on your site
04Site Impact
Any authenticated user can compromise your entire site, including database access and file modification.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege user account (e.g., subscriber or contributor role).
Key dates
06Disclosure timeline
July 26, 2026
CVE published
