Spam protection, Honeypot, Anti-Spam by CleanTalk < 6.87 - Unauthenticated Stored XSS via Comment Content aria-label Placeholder

Description

The plugin is vulnerable to Stored Cross-Site Scripting via Comment Content aria-label Placeholder 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.