CleanTalk Spam protection, Anti-Spam, FireWall Plugin up to 6.71 on WordPress Plugin Installation checkWithoutToken authorization

Summaryinfo

A vulnerability labeled as problematic has been found in CleanTalk Spam protection, Anti-Spam, FireWall Plugin up to 6.71 on WordPress. Affected by this vulnerability is the function checkWithoutToken of the component Plugin Installation Handler. The manipulation results in authorization. This vulnerability is cataloged as CVE-2026-1490. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in CleanTalk Spam protection, Anti-Spam, FireWall Plugin up to 6.71 on WordPress. Affected is the function checkWithoutToken of the component Plugin Installation Handler. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-1490. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/20/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-5835). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Anti-Spam Software

Vendor

• CleanTalk

Name

• Spam protection, Anti-Spam, FireWall Plugin

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9
• 6.10
• 6.11
• 6.12
• 6.13
• 6.14
• 6.15
• 6.16
• 6.17
• 6.18
• 6.19
• 6.20
• 6.21
• 6.22
• 6.23
• 6.24
• 6.25
• 6.26
• 6.27
• 6.28
• 6.29
• 6.30
• 6.31
• 6.32
• 6.33
• 6.34
• 6.35
• 6.36
• 6.37
• 6.38
• 6.39
• 6.40
• 6.41
• 6.42
• 6.43
• 6.44
• 6.45
• 6.46
• 6.47
• 6.48
• 6.49
• 6.50
• 6.51
• 6.52
• 6.53
• 6.54
• 6.55
• 6.56
• 6.57
• 6.58
• 6.59
• 6.60
• 6.61
• 6.62
• 6.63
• 6.64
• 6.65
• 6.66
• 6.67
• 6.68
• 6.69
• 6.70
• 6.71

CPE 2.3info

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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