What the vulnerability does
01Description
The Nexter Extension – Site Enhancements Toolkit plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.4.6 via deserialization of untrusted input in the 'nxt_unserialize_replace' function. This makes it possible for unauthenticated attackers 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
The Nexter Extension contains a deserialization vulnerability in versions up to 4.4.6. An attacker can send a specially crafted request over the network to deserialize untrusted data, potentially executing arbitrary code on the site. No authentication or user interaction is required. Sites running affected versions should update immediately.
What an attacker can do
03Attacker Capabilities
Run arbitrary code on the site by sending a malicious network request.
Potential impact on your site
04Site Impact
Complete site compromise: attacker can read data, modify content, create accounts, or take full control.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
January 20, 2026
CVE published
April 14, 2026
Record updated
