XSS in Spacetime Ad Inserter – Manager & Adsense Ads
CVE-2026-89427
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/c01f98a4-c349-4cb2-b09a-5cbad…
- plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php
- plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php
- plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php
- plugins.trac.wordpress.org/changeset
- plugins.trac.wordpress.org/changeset/3709957/ad-inserter/trunk/ad-inserter.php
Frequently asked questions
- What is CVE-2026-89427?
- CVE-2026-89427 is a medium-severity vulnerability in Spacetime Ad Inserter – Manager & Adsense Ads, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-01.
- How severe is CVE-2026-89427?
- Medium severity. CVSS v3 base score is 6.1 out of 10.