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CVE-2021-24884— Formidable Form Builder < 4.09.05 - Unauthenticated Stored Cross-Site Scripting

Quick assessment

Affected
Unknown Formidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 8.8 Difficulty: Easy EPSS 3.13% · P87
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Unknown Formidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress 4.09.05 ~ 4.09.05 -

II. Public POCs for CVE-2021-24884

# POC Description Source Link Shenlong Link
1 If 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-2021-24884 POC Details
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III. Intelligence Information for CVE-2021-24884

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Patches & Fixes for CVE-2021-24884 (1)

Vendor Advisories for CVE-2021-24884 (1)

Other References for CVE-2021-24884 (1)

Same Patch Batch · Unknown · 2021-10-25 · 20 CVEs total

CVE-2021-24608 Formidable Form Builder < 5.0.07 - Admin+ Stored Cross-Site Scripting
CVE-2021-24885 YOP Poll < 6.1.2 - Reflected Cross-Site Scripting
CVE-2021-24785 Great Quotes <= 1.0.0 - Admin+ Stored Cross-Site Scripting
CVE-2021-24779 WP Debugging < 2.11.0 - Unauthenticated Plugin's Settings Update
CVE-2021-24774 Check & Log Email < 1.0.3 - Admin+ SQL Injections
CVE-2021-24769 Permalink Manager Lite < 2.2.13.1 - Admin+ SQL Injection
CVE-2021-24744 WordPress Contact Forms by Cimatti < 1.4.12 - Admin+ Stored Cross-Site Scripting
CVE-2021-24699 Easy Media Download < 1.1.7 - Contributor+ Stored Cross-Site Scripting
CVE-2021-24662 Game Server Status <= 1.0 - Admin+ SQL Injection
CVE-2021-24653 Cookie Bar < 1.8.9 - Admin+ Stored Cross-Site Scripting
CVE-2021-24381 NinjaForms < 3.5.8.2 - Admin+ Stored Cross-Site Scripting
CVE-2021-24544 Responsive WordPress Slider <= 2.2.0 - Subscriber+ Stored Cross-Site Scripting
CVE-2021-24543 jQuery Reply to Comment <= 1.31 - CSRF to Stored Cross-Site Scripting
CVE-2021-24515 Video Gallery - Vimeo and YouTube Gallery < 1.1.5 - Admin+ Stored Cross-Site Scripting
CVE-2021-24514 Visual Form Builder < 3.0.4 - Admin+ Stored Cross-Site Scripting
CVE-2021-24489 Request a Quote < 2.3.9 - Admin+ Stored Cross-Site Scripting
CVE-2021-24487 St Daily Tip <= 4.7 - CSRF to Stored Cross-Site Scripting
CVE-2021-24485 Special Text Boxes < 5.9.110 - Admin+ Stored Cross-Site Scripting
CVE-2021-24414 YT Player < 1.4 - Contributor+ Stored Cross-Site Scripting

IV. Related Vulnerabilities

Same product: Formidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress
Same vendor: Unknown
Same weakness: CWE-79

V. Comments for CVE-2021-24884

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