CVE-2026-77830

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.

CVSS Vector

References

• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.84/cleantalk.php#L234
• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.84/lib/Cleantalk/ApbctWP/ContactsEncoder/ContactsEncoder.php#L114
• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.84/lib/Cleantalk/Common/ContactsEncoder/ContactsEncoder.php#L914
• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.84/lib/Cleantalk/Common/ContactsEncoder/ContactsEncoder.php#L933
• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.85/cleantalk.php#L234
• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.85/lib/Cleantalk/ApbctWP/ContactsEncoder/ContactsEncoder.php#L114
• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.85/lib/Cleantalk/Common/ContactsEncoder/ContactsEncoder.php#L914
• https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.85/lib/Cleantalk/Common/ContactsEncoder/ContactsEncoder.php#L933
• https://plugins.trac.wordpress.org/changeset/3677388/cleantalk-spam-protect/trunk/lib/Cleantalk/Common/ContactsEncoder/ContactsEncoder.php
• https://plugins.trac.wordpress.org/changeset?old_path=%2Fcleantalk-spam-protect/tags/6.86&new_path=%2Fcleantalk-spam-protect/tags/6.87
• https://plugins.trac.wordpress.org/changeset?reponame=&new=3677388%40cleantalk-spam-protect%2Ftags%2F6.87&old=3654120%40cleantalk-spam-protect%2Ftags%2F6.86
• https://www.wordfence.com/threat-intel/vulnerabilities/id/10e7000b-597a-4165-8604-cb6b29714abb?source=cve