CVE-2021-24884 Formidable Form Builder < 4.09.05 - Unauthenticated Stored Cross-Site Scripting
Unauthenticated attackers can inject malicious HTML into form entries, leading to stored XSS that enables account takeover or remote code execution when clicked by authenticated users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-24884?
CVE-2021-24884 is a critical cross-site scripting vulnerability in Unknown Formidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress, published on 25 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2021-24884?
It affects 1 product.
Products include Strategy11 Formidable Form Builder.
How do I fix CVE-2021-24884?
No fix has been published for CVE-2021-24884 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-24884 being exploited?
There is no known exploitation of CVE-2021-24884 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Unknown Formidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress
- CVE-2019-15780 Deserialization in n/a
- CVE-2017-20192 Formidable Form Builder < 2.05.03 - Unauthenticated Stored Cross-Site Scripting
- CVE-2023-24419 WordPress Formidable Forms Plugin <= 5.5.6 is vulnerable to Cross Site Request Forgery (CSRF)
- CVE-2023-6830 Formidable Forms <= 6.7 - HTML Injection
- CVE-2023-0816 Formidable Forms < 6.1 - IP Spoofing
Sources
Also known as GHSA-h6gj-jhrr-g634.