What the vulnerability does
01Description
The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom field through the plugin's 'adinserter' shortcode in all versions up to, and including, 2.8.7 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Ad Inserter versions up to 2.8.7 contain a cross-site scripting vulnerability that allows authenticated users to inject malicious scripts affecting other site visitors. The vulnerability exists due to improper sanitization of user input in ad content. An attacker with low-level site access can craft malicious ads that execute in visitors' browsers, potentially stealing session data or redirecting users.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts into ads that execute in other users' browsers and steal data or redirect them.
Potential impact on your site
04Site Impact
Visitors may be redirected, have sessions hijacked, or see malicious content injected into your site's ad network.
Conditions required to exploit
05Prerequisites
Attacker needs a low-privilege account (e.g., contributor or editor role) on the site.
Key dates
06Disclosure timeline
November 5, 2025
CVE published
April 8, 2026
Record updated
