DNS
CVE-2026-1490
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
CleanTalk Anti-Spam WordPress plugin has an authorization bypass enabling unauthenticated attackers to perform file operations on the WordPress server.
Technical ContextAI
The CleanTalk Anti-Spam/FireWall plugin has a CWE-350 reliance on reverse DNS for authorization, which can be spoofed to bypass access controls.
Affected ProductsAI
Spam protection, Anti-Spam, FireWall by CleanTalk
RemediationAI
Update the plugin. Implement token-based authorization instead of DNS-based.
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External POC / Exploit Code
Leaving vuln.today