CVE-2026-77830
Published 2026-09-05 · Source security@wordfence.com
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: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
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

