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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.

PUBLISHED Reserved 2026-01-27 | Published 2026-02-15 | Updated 2026-02-15 | Assigner Wordfence




CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action

Product status

Default status
unaffected

* (semver)
affected

Timeline

2026-01-27:Vendor Notified
2026-02-14:Disclosed

Credits

Nguyen Ngoc Duc finder

References

www.wordfence.com/...-4a12-49e1-b8cc-b2062eb97f16?source=cve

plugins.trac.wordpress.org/...antalk/ApbctWP/RemoteCalls.php

plugins.trac.wordpress.org/...ib/Cleantalk/Common/Helper.php

plugins.trac.wordpress.org/...3454488/cleantalk-spam-protect

cve.org (CVE-2026-1490)

nvd.nist.gov (CVE-2026-1490)

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