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CVE-2026-1426

8.8 · HIGH

The Advanced AJAX Product Filters plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.9.6 via deserialization of untrusted input in the shortcode_ch…

Published Feb 18, 2026CWE-502EPSS 0.53%

Overview

CVE-2026-1426 is a high-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

The Advanced AJAX Product Filters plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.9.6 via deserialization of untrusted input in the shortcode_check function within the Live Composer compatibility layer. This makes it possible for authenticated attackers, with Author-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. Note: This vulnerability requires the Live Composer plugin to also be installed and active.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcwe.mitre.org/data/definitions/502.htmlRefplugins.trac.wordpress.org/browser/woocommerce-ajax-filters/trunk/includes/compatibility/live_composer.php#L25Refplugins.trac.wordpress.org/browser/woocommerce-ajax-filters/trunk/includes/compatibility/live_composer.php#L28Refplugins.trac.wordpress.org/browser/woocommerce-ajax-filters/trunk/includes/compatibility/live_composer.php#L33Refplugins.trac.wordpress.org/changeset/3449344/#file418Refwww.wordfence.com/threat-intel/vulnerabilities/id/29e76d57-217f-4f21-8bc6-a86290783a19?source=cve

How CyberStrike helps

Frequently asked questions

What is CVE-2026-1426?

CVE-2026-1426 is a high-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-1426?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-1426?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-1426?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-1426 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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