PHP Object Injection Vulnerability in Advanced AJAX Product Filters for WordPress

CVE-2026-1426

What is CVE-2026-1426?

The Advanced AJAX Product Filters plugin for WordPress is susceptible to PHP Object Injection due to improper handling of untrusted input during the deserialization process in the shortcode_check function of the Live Composer compatibility layer. This vulnerability can be exploited by authenticated users with Author-level privileges or higher, allowing them to inject a PHP Object. While the vulnerability itself does not directly result in harmful actions, it poses a significant risk if combined with another plugin or theme that contains a PHP Object Pollution (POP) chain. If such a chain is present, attackers may gain capabilities to delete files, access sensitive data, or execute malicious code on the affected system, particularly if the Live Composer plugin is also active.

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