CVE-2026-109198 Anti-Spam by CleanTalk <= 6.89.1 - Unauthenticated Stored Cross-Site Scripting via 'user_email' Registration Parameter
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-109198?
CVE-2026-109198 is a high-severity vulnerability in CleanTalk Anti-Spam – Complete Spam Protection, published on 23 Oct 2026.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-109198?
How do I fix CVE-2026-109198?
No fix has been published for CVE-2026-109198 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109198 being exploited?
There is no known exploitation of CVE-2026-109198 in the wild and no public exploit code.
Sources
Also known as GHSA-qg8v-7rmw-27ch.