What the vulnerability does
01Description
The wpForo Forum plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.4.13 via deserialization of untrusted input in the 'wpforo_display_array_data' function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
Explanation of Vulnerability in Simple Terms
02Summary
wpForo Forum versions up to 2.4.13 contain a deserialization vulnerability that allows authenticated users to execute arbitrary code on the site. An attacker with a user account can craft malicious serialized data that, when processed by the forum, runs their own PHP code with full site privileges. This affects confidentiality, integrity, and availability of the entire installation.
What an attacker can do
03Attacker Capabilities
Run arbitrary PHP code on the site with full privileges, compromising all data and functionality.
Potential impact on your site
04Site Impact
Any registered forum user can take over the site, steal data, modify content, or disable the forum entirely.
Conditions required to exploit
05Prerequisites
Attacker must have a valid user account on the forum (low-privilege login sufficient).
Key dates
06Disclosure timeline
February 11, 2026
CVE published
April 8, 2026
Record updated
