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I. Basic Information for CVE-2021-24884
Vulnerability Information

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Vulnerability Title
Formidable Form Builder < 4.09.05 - Unauthenticated Stored Cross-Site Scripting
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Formidable Form Builder WordPress plugin before 4.09.05 allows to inject certain HTML Tags like <audio>,<video>,<img>,<a> and<button>.This could allow an unauthenticated, remote attacker to exploit a HTML-injection byinjecting a malicous link. The HTML-injection may trick authenticated users to follow the link. If the Link gets clicked, Javascript code can be executed. The vulnerability is due to insufficient sanitization of the "data-frmverify" tag for links in the web-based entry inspection page of affected systems. A successful exploitation incomibantion with CSRF could allow the attacker to perform arbitrary actions on an affected system with the privileges of the user. These actions include stealing the users account by changing their password or allowing attackers to submit their own code through an authenticated user resulting in Remote Code Execution. If an authenticated user who is able to edit Wordpress PHP Code in any kind, clicks the malicious link, PHP code can be edited.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress是WordPress(Wordpress)基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。 WordPress plugin The Formidable Form Builder 4.09.05之前版本存在跨站脚本漏洞,该漏洞源于插件对受影响系统的基于Web的条目检查页面中的链接的"data-frmverify"标签的清理不足,攻击者可以以用户的权限在受影响的系统上执行任意操作。
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)
Affected Products
VendorProductAffected VersionsCPESubscribe
UnknownFormidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress 4.09.05 ~ 4.09.05 -
II. Public POCs for CVE-2021-24884
#POC DescriptionSource LinkShenlong Link
1If an authenticated user who is able to edit Wordpress PHP code in any kind, clicks a malicious link, PHP code can be edited through XSS in Formidable Forms 4.09.04.https://github.com/S1lkys/CVE-2021-24884POC Details
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III. Intelligence Information for CVE-2021-24884
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IV. Related Vulnerabilities
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