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CVE-2026-77830— Spam protection, Honeypot, Anti-Spam by CleanTalk <= 6.86 - Unauthenticated Stored Cross-Site Scripting via Comment Content aria-label Placeholder

Quick assessment

Affected
cleantalk Spam protection, Honeypot, Anti-Spam by CleanTalk
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 CleanTalk 的垃圾邮件防护、蜜罐、反垃圾邮件功能在所有版本（最高至 6.86 版）中，由于输入净化和输出转义不足，导致通过评论内容的 占位符存在存储型跨站脚本（Stored XSS）漏洞。这使得具有自定义级别（custom-level）及以上权限的已认证攻击者，能够在页面中注入任意 Web 脚本，当用户访问被注入的页面时，脚本将自动执行。该攻击载荷可通过未经身份验证的评论提交传递，且仅在未登录的访客端执行；若启用了评论审核机制，则需审核人员先发布该评论后，脚本才能影响其他用户。

CVSS 7.2 · High
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I. Basic Information for CVE-2026-77830

Vulnerability Information
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Vulnerability Title
Spam protection, Honeypot, Anti-Spam by CleanTalk <= 6.86 - Unauthenticated Stored Cross-Site Scripting via Comment Content aria-label Placeholder
Source: CVE Program / CVE List V5
Vulnerability Description
The Spam protection, Honeypot, Anti-Spam by CleanTalk plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content aria-label Placeholder in all versions up to, and including, 6.86 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with custom-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload is deliverable via unauthenticated comment submission and executes exclusively for non-logged-in visitors; if comment moderation is enabled, an approving moderator must first publish the comment before the script reaches other users.
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 Spam protection, Honeypot, Anti-Spam by CleanTalk 0 ~ 6.86 -

II. Public POCs for CVE-2026-77830

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III. Intelligence Information for CVE-2026-77830

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Patches & Fixes for CVE-2026-77830 (4)

Vendor Advisories for CVE-2026-77830 (1)

Vendor Pages for CVE-2026-77830 (1)

IV. Related Vulnerabilities

Same product: Spam protection, Honeypot, Anti-Spam by CleanTalk
Same vendor: cleantalk
Same weakness: CWE-79

V. Comments for CVE-2026-77830

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