Unauthorized Plugin Installation in CleanTalk's Spam Protection Plugin for WordPress
CVE-2026-1490

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Spam Protection, Honeypot, Anti-spam By Cleantalk
Vendor
CVE Published:
15 February 2026

What is CVE-2026-1490?

The Spam Protection, Anti-Spam, FireWall plugin by CleanTalk for WordPress is susceptible to an authorization bypass, allowing unauthenticated attackers to exploit the 'checkWithoutToken' function. This vulnerability stems from reverse DNS (PTR record) spoofing and affects all versions up to and including 6.71. Attackers can leverage this flaw to install and activate unauthorized plugins on affected sites, posing a significant risk for remote code execution, particularly if other vulnerable plugins are present. It is important to note that exploitation is contingent upon the use of an invalid API key.

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Deploy the Patch

Affected Version(s)

Spam protection, Honeypot, Anti-Spam by CleanTalk * <= 6.71

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/cleantalk-spam...
https://plugins.trac.wordpress.org/browser/cleantalk-spam...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nguyen Ngoc Duc
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