Vulnerability Description
The Anti-Spam by CleanTalk – Spam Protection Without CAPTCHA plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 6.89.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Successful exploitation requires user registration to be open on the site, and script execution is triggered when an Administrator subsequently runs the plugin's user-spam scan and views the resulting Non-checkable users or Spam users tab — the plugin's own documented workflow.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/in
- https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/li
- https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/li
- https://plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/li
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3747972%40cleantalk-s
- https://www.wordfence.com/threat-intel/vulnerabilities/id/93cf8a35-61a4-4998-ae3
FAQ
What is CVE-2026-109198?
CVE-2026-109198 is a vulnerability with a CVSS score of 7.2 (HIGH). The Anti-Spam by CleanTalk – Spam Protection Without CAPTCHA plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 6.89...
How severe is CVE-2026-109198?
CVE-2026-109198 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-109198?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.