CVE-2026-109198
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk28th percentile - higher than 28% of all known CVEs
Summary
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 allows unauthenticated attackers to inject arbitrary web scripts that execute when a user accesses an injected page. Exploitation requires open user registration, and script execution is triggered when an Administrator runs the plugin's user-spam scan and views the Non-checkable users or Spam users tab.
Risk Assessment
Arbitrary JavaScript execution in the administrator's browser context is possible, potentially leading to session hijacking or unauthorized actions. However, it requires open registration and administrator interaction.
Recommendation
Update the Anti-Spam by CleanTalk plugin to a version later than 6.89.1 if available. Consider disabling open registration or restricting it to trusted users.
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Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS

