---
id: CVE-2026-89427
title: >-
  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
  escap…
summary: >-
  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
  escap…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: spacetime
product: Ad Inserter – Ad Manager & AdSense Ads
affected:
  - ad_inserter_ad_manager_adsense_ads <= 2.8.18
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T09:17:09.753'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89427'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L12903
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13012
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13081
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3709957/ad-inserter/trunk/ad-inserter.php
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&new=3709970%40ad-inserter%2Ftags%2F2.8.19&old=3624916%40ad-inserter%2Ftags%2F2.8.18
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/c01f98a4-c349-4cb2-b09a-5cbadfcad830?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T09:41:14.157Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.