What the vulnerability does
01Description
The ConvertPlus plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.5.26 via deserialization of untrusted input from the 'settings_encoded' attribute of the 'smile_modal' shortcode. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
Explanation of Vulnerability in Simple Terms
02Summary
ConvertPlus versions up to 3.5.26 contain a deserialization vulnerability that allows authenticated attackers to execute arbitrary code on the site. The vulnerability exists because the plugin deserializes untrusted data without proper validation. An attacker with low-level access can craft malicious serialized objects to trigger code execution, potentially compromising the entire site.
What an attacker can do
03Attacker Capabilities
Run arbitrary code on the site with the privileges of the web server.
Potential impact on your site
04Site Impact
Complete site compromise possible; attacker can read/modify data, create admin accounts, or inject malware.
Conditions required to exploit
05Prerequisites
Attacker must have a low-level user account (subscriber or above) and network access to the site.
Key dates
06Disclosure timeline
May 16, 2024
CVE published
April 8, 2026
Record updated
