XSS in Cleantalk Anti-Spam – Complete Spam Protection
CVE-2026-109198
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/93cf8a35-61a4-4998-ae34-86c96…
- plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/lib/Clean…
- plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/lib/Clean…
- plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/lib/Clean…
- plugins.trac.wordpress.org/browser/cleantalk-spam-protect/tags/6.89.1/inc/clean…
- plugins.trac.wordpress.org/changeset
Frequently asked questions
- What is CVE-2026-109198?
- CVE-2026-109198 is a high-severity vulnerability in Cleantalk Anti-Spam – Complete Spam Protection, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-10-23.
- How severe is CVE-2026-109198?
- High severity. CVSS v3 base score is 7.2 out of 10.