CVE-2026-1490— Spam protection, Honeypot, Anti-Spam by CleanTalk <= 6.71 - Authorization Bypass via Reverse DNS (PTR record) Spoofing to Unauthenticated Arbitrary Plugin Installation
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I. Basic Information for CVE-2026-1490
Vulnerability Information
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Vulnerability Title
Spam protection, Honeypot, Anti-Spam by CleanTalk <= 6.71 - Authorization Bypass via Reverse DNS (PTR record) Spoofing to Unauthenticated Arbitrary Plugin Installation
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不恰当地信任反向DNS
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin Spam protection, Anti-Spam, FireWall by CleanTalk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Spam protection, Anti-Spam, FireWall by CleanTalk 6.71及之前版本存在安全漏洞，该漏洞源于授权绕过，可能导致任意插件安装和远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| cleantalk | Spam protection, Honeypot, Anti-Spam by CleanTalk | * ~ 6.71 | - |
II. Public POCs for CVE-2026-1490
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | None | https://github.com/comthompson30/CVE-2026-1490 | POC Details |
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IV. Related Vulnerabilities
Same vendor: cleantalk
- CVE-2025-13604
Login Security, FireWall, Malware removal by CleanTalk <= 2. - CVE-2024-13365
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Spam protection, Anti-Spam, FireWall by CleanTalk <= 6.44 - - CVE-2024-10542
Spam protection, Anti-Spam, FireWall by CleanTalk <= 6.43.2 - CVE-2024-10570
Security & Malware scan by CleanTalk <= 2.145 - Authorizatio
Same weakness: CWE-350
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V. Comments for CVE-2026-1490
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