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CVE-2026-103424— Anti-Spam by CleanTalk <= 6.88 - Unauthenticated Stored Cross-Site Scripting via Comment Content via ContactsEncoder Greedy Regex

Quick assessment

Affected
cleantalk Anti-Spam by CleanTalk – Spam Protection Without CAPTCHA
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 反垃圾邮件插件 Anti-Spam by CleanTalk – Spam Protection Without CAPTCHA 存在存储型跨站脚本漏洞（Stored Cross-Site Scripting, XSS）。该漏洞影响 6.88 及更早版本，原因是插件对 'comment' 参数缺乏充分的输入净化和输出转义。 此漏洞允许未经身份验证的攻击者在网站页面中注入任意 Web 脚本，当其他用户访问被注入恶意脚本的页面时，脚本将会自动执行。只要攻击者发送的评论被审核通过，该漏洞即可被利用。在

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-103424

Vulnerability Information
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Vulnerability Title
Anti-Spam by CleanTalk <= 6.88 - Unauthenticated Stored Cross-Site Scripting via Comment Content via ContactsEncoder Greedy Regex
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 'comment' parameter in all versions up to, and including, 6.88 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. This vulnerability is exploitable once a comment from the attacker's email address has been approved; on default WordPress installations, only the first comment from a given email address is held for moderation, meaning subsequent comments auto-approve and immediately expose the payload to site visitors.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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 Anti-Spam by CleanTalk – Spam Protection Without CAPTCHA 0 ~ 6.88 -

II. Public POCs for CVE-2026-103424

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III. Intelligence Information for CVE-2026-103424

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Vendor Advisories for CVE-2026-103424 (1)

IV. Related Vulnerabilities

Same vendor: cleantalk
Same weakness: CWE-79

V. Comments for CVE-2026-103424

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