Anti-Spam by CleanTalk <= 6.90 - Unauthenticated Stored Cross-Site Scripting via Comment Author Fields
- ID
- WPSEC-2026-2028
- Plugin
- Anti-Spam, Spam FireWall by CleanTalk (cleantalk-spam-protect)
- Affected
- all versions before 6.91
- Remediation
- Update to 6.91 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin High · Affected versions High among sites WPSec scans, 2026-10-30
- Attack surface
- Anti-Spam by CleanTalk on WPSec AttackSurface
- Fix released
- Published
Description
The Anti-Spam, Spam FireWall by CleanTalk plugin for WordPress is vulnerable to Stored Cross-Site Scripting via comment data shown in the admin 'Find Spam' comments list in all versions up to, and including, 6.90 due to the comment author e-mail being placed unescaped inside a single-quoted href attribute in the Find Spam comments results; e-mail addresses may legally contain quote characters. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the scan results, provided the scan flags the comment as spam (its IP or e-mail is on the CleanTalk blacklist at scan time).
References
- https://wpsec.com/vuln/WPSEC-2026-2028/
- https://plugins.svn.wordpress.org/cleantalk-spam-protect/tags/6.91/
- https://wordpress.org/plugins/cleantalk-spam-protect/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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