Vulnerability in Ad Inserter – Ad Manager & AdSense Ads — CVE-2026-89427

What to do now

Update Ad Inserter – Ad Manager & AdSense Ads to 2.8.19 or later.

Affected versions

• Everything up to and including 2.8.18

The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 's' Search Parameter in all versions up to, and including, 2.8.18 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires that a site administrator has configured at least one Ad Inserter block using the {title} or {short-title} placeholder with that block enabled for search pages, which is a standard, documented plugin feature.

This description is reproduced verbatim from the public vulnerability record.

• https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L12903
• https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13012
• https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13081
• https://plugins.trac.wordpress.org/changeset/3709957/ad-inserter/trunk/ad-inserter.php
• https://plugins.trac.wordpress.org/changeset?reponame=&new=3709970%40ad-inserter%2Ftags%2F2.8.19&old=3624916%40ad-inserter%2Ftags%2F2.8.18
• https://www.wordfence.com/threat-intel/vulnerabilities/id/c01f98a4-c349-4cb2-b09a-5cbadfcad830?source=cve

This page is compiled automatically from public databases. Accuracy is not guaranteed; confirm against the vendor advisory before acting.