Vulnerabilities / Anti-Spam by CleanTalk / WPSEC-2026-2023
Anti-Spam by CleanTalk <= 6.90 - Unauthenticated Contacts Encoder Bypass via Public Pass Key
Medium 5.3
CWE-565Fixed in 6.91
- ID
- WPSEC-2026-2023
- 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:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness
- CWE-565
- 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 a Protection Mechanism Bypass via the Contacts Encoder in all versions up to, and including, 6.90. This is due to the 'apbct_email_encoder_passed' cookie being compared against a pass key that the plugin prints to every visitor. This makes it possible for unauthenticated attackers to have e-mail addresses and phone numbers protected by the Contacts Encoder shown unencoded.
References
- https://wpsec.com/vuln/WPSEC-2026-2023/
- 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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