Anti-Spam by CleanTalk <= 6.90 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Business Directory Field Display
- ID
- WPSEC-2026-2027
- Plugin
- Anti-Spam, Spam FireWall by CleanTalk (cleantalk-spam-protect)
- Affected
- from 6.47 before 6.91
- Remediation
- Update to 6.91 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:L/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 the Business Directory Plugin field display integration of the Contacts Encoder in all versions up to, and including, 6.90, due to ContactsEncoder::modifyFormFieldDisplay() running html_entity_decode() on the whole escaped field HTML whenever it contains 'mailto:'. This turns escaped markup back into live HTML. This makes it possible for authenticated attackers with Subscriber-level access and above, or unauthenticated attackers where the directory allows guest listings, to inject arbitrary web scripts into directory listings that run when a user views them.
References
- https://wpsec.com/vuln/WPSEC-2026-2027/
- 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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