Critical severity9.8NVD Advisory· Published Feb 15, 2026· Updated Apr 15, 2026
CVE-2026-1490
CVE-2026-1490
Description
The Spam protection, Anti-Spam, FireWall by CleanTalk plugin for WordPress is vulnerable to unauthorized Arbitrary Plugin Installation due to an authorization bypass via reverse DNS (PTR record) spoofing on the 'checkWithoutToken' function in all versions up to, and including, 6.71. This makes it possible for unauthenticated attackers to install and activate arbitrary plugins which can be leveraged to achieve remote code execution if another vulnerable plugin is installed and activated. Note: This is only exploitable on sites with an invalid API key.
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Affected products
2- Range: <=6.71
Patches
Vulnerability mechanics
References
4- plugins.trac.wordpress.org/browser/cleantalk-spam-protect/trunk/lib/Cleantalk/ApbctWP/RemoteCalls.phpnvd
- plugins.trac.wordpress.org/browser/cleantalk-spam-protect/trunk/lib/Cleantalk/Common/Helper.phpnvd
- plugins.trac.wordpress.org/changeset/3454488/cleantalk-spam-protectnvd
- www.wordfence.com/threat-intel/vulnerabilities/id/cb603be6-4a12-49e1-b8cc-b2062eb97f16nvd
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