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CVE-2026-109198— Anti-Spam by CleanTalk <= 6.89.1 - Unauthenticated Stored Cross-Site Scripting via 'user_email' Registration Parameter

Quick assessment

Affected
cleantalk CleanTalk Anti-Spam – Complete Spam Protection
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"Anti-Sam by CleanTalk – 无验证码垃圾邮件防护”在所有 6.89.1 及更早版本中，因输入过滤不足和输出转义缺失，存在存储型跨站脚本（Stored XSS）漏洞，攻击向量为参数"user_email"。该漏洞允许未认证的攻击者在页面上注入任意 Web 脚本；当用户访问被注入的页面时，这些脚本将被执行。成功利用该漏洞需满足以下条件：网站开放用户注册，且管理员随后运行插件的“用户垃圾邮件扫描”功能，并查看生成的“不可检查用户”或“垃圾邮件用户”标签页——这正是插件官方文档

CVSS 7.2 · High

Possible ATT&CK Techniques 2 AI

T1071.004 · DNS T1059.007 · JavaScript
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I. Basic Information for CVE-2026-109198

Vulnerability Information
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Vulnerability Title
Anti-Spam by CleanTalk <= 6.89.1 - Unauthenticated Stored Cross-Site Scripting via 'user_email' Registration Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Anti-Spam by CleanTalk – Spam Protection Without CAPTCHA plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 6.89.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Successful exploitation requires user registration to be open on the site, and script execution is triggered when an Administrator subsequently runs the plugin's user-spam scan and views the resulting Non-checkable users or Spam users tab — the plugin's own documented workflow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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
cleantalk CleanTalk Anti-Spam – Complete Spam Protection 0 ~ 6.89.1 -

II. Public POCs for CVE-2026-109198

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III. Intelligence Information for CVE-2026-109198

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Other References for CVE-2026-109198 (6)

IV. Related Vulnerabilities

Same vendor: cleantalk
Same weakness: CWE-79

V. Comments for CVE-2026-109198

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