Spam protection, Anti-Spam, FireWall by CleanTalk, CVE-2026-77830

CVE, Research URL: CVE-2026-77830
Home page URL: Security reports for Spam protection, Anti-Spam, FireWall by CleanTalk
Application: Spam protection, Anti-Spam, FireWall by CleanTalk
Published on: Sep 05, 2026
Research 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.
Affected versions: max 6.87.
Status: vulnerable