CVE-2026-89427
Received Received - Intake

Reflected XSS in Ad Inserter WordPress Plugin

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: Wordfence

Description
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.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-89427
EUVD
EUVD-2026-90572

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
wordpress ad_inserter to 2.8.18 (inc)
wordimpress ad_inserter to 2.8.18 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Reflected Cross-Site Scripting (XSS) issue in the Ad Inserter WordPress plugin. It occurs due to insufficient input sanitization and output escaping in the 's' search parameter. Attackers can inject malicious scripts into pages that execute when a user clicks a crafted link. Exploitation requires a site admin to have configured Ad Inserter blocks with {title} or {short-title} placeholders on search pages.

Detection Guidance

To detect this vulnerability, check if the Ad Inserter plugin is installed and verify its version. If it is version 2.8.18 or lower, it is vulnerable. Look for suspicious search parameters in URLs containing 's=' on pages where Ad Inserter blocks are active.

Impact Analysis

Unauthenticated attackers could steal user sessions, redirect users to malicious sites, or perform actions on their behalf. Users visiting compromised pages may have their data exposed or devices infected. Website administrators risk reputational damage and potential legal consequences if user data is compromised.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements. Organizations may face fines or penalties for failing to protect user information, especially if the XSS leads to data breaches or unauthorized data exposure.

Mitigation Strategies

Immediately update the Ad Inserter plugin to the latest version. If an update is not available, consider disabling the plugin or removing Ad Inserter blocks using {title} or {short-title} placeholders on search pages. Review server logs for unusual search parameter activity.

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