CVE-2026-89427 json
Ad Inserter <= 2.8.18 - Reflected Cross-Site Scripting via 's' Search Parameter
published 2026-10-01 39 d ago modified 2026-10-03 36 d ago also EUVD-2026-90572
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 16%
- public exploits
- 0
- none known
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 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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 36 d ago
Exploit prediction
0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected products
- spacetime Ad Inserter – Ad Manager & AdSense Ads
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/c01f98a4-c349-4cb2-b09a-5cbadfcad830?source=cve
- plugins.trac.wordpress.org /browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13081
- plugins.trac.wordpress.org /browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13012
- plugins.trac.wordpress.org /browser/ad-inserter/tags/2.8.18/ad-inserter.php#L12903
- plugins.trac.wordpress.org /changeset?reponame=&new=3709970%40ad-inserter%2Ftags%2F2.8.19&old=3624916%40ad-inserter%2Ftags%2F2.8.18
- plugins.trac.wordpress.org /changeset/3709957/ad-inserter/trunk/ad-inserter.php
Sources
- CVE List CVE-2026-89427
- NVD CVE-2026-89427
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.