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CVE-2026-89427— Ad Inserter <= 2.8.18 - Reflected Cross-Site Scripting via 's' Search Parameter

Quick assessment

Affected
spacetime Ad Inserter – Ad Manager & AdSense Ads
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 Ad Inserter – Ad Manager & AdSense Ads 在包括 2.8.18 在内的所有版本中，由于输入净化不足和输出转义不当，存在通过 's' 搜索参数引发的反射型跨站脚本（XSS）漏洞。这使得未认证的攻击者能够注入任意 Web 脚本，前提是成功诱骗用户执行某些操作（例如点击链接），从而在相应页面中执行这些脚本。利用该漏洞的前提是：站点管理员已配置至少一个 Ad Inserter 广告块，使用了 {title} 或 {short-title} 占位符，并且该广告块已

CVSS 6.1 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-89427

Vulnerability Information
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Vulnerability Title
Ad Inserter <= 2.8.18 - Reflected Cross-Site Scripting via 's' Search Parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
spacetime Ad Inserter – Ad Manager & AdSense Ads 0 ~ 2.8.18 -

II. Public POCs for CVE-2026-89427

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III. Intelligence Information for CVE-2026-89427

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Patches & Fixes for CVE-2026-89427 (2)

Vendor Advisories for CVE-2026-89427 (1)

Other References for CVE-2026-89427 (3)

IV. Related Vulnerabilities

Same product: Ad Inserter – Ad Manager & AdSense Ads
Same vendor: spacetime
Same weakness: CWE-79

V. Comments for CVE-2026-89427

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