CVE-2021-36821 WordPress Forminator plugin <= 1.14.11 - Stored Cross-Site Scripting (XSS) vulnerability
An attacker can inject malicious scripts into the Forminator plugin, potentially executing code in victim browsers and compromising accounts.
- 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-2021-36821?
CVE-2021-36821 is a high-severity cross-site scripting vulnerability in WPMU DEV Forminator, published on 16 Mar 2023. 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
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WPMU DEV Forminator allows Stored XSS.This issue affects Forminator: from n/a through 1.14.11.
Weakness: CWE-79
Which versions are affected by CVE-2021-36821?
It affects 1 product.
Products include Incsub Forminator.
How do I fix CVE-2021-36821?
No fix has been published for CVE-2021-36821 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-2021-36821 being exploited?
There is no known exploitation of CVE-2021-36821 in the wild and no public exploit code.
Other vulnerabilities in WPMU DEV Forminator
- CVE-2023-4596 Forminator <= 1.24.6 - Unauthenticated Arbitrary File Upload
- CVE-2025-6463 Path traversal in Forminator Forms – Contact Form, Payment Form & Custom Form Builder
- CVE-2025-6464 Deserialization in Forminator Forms – Contact Form, Payment Form & Custom Form Builder
- CVE-2024-7389 Forminator <= 1.29.1 - HubSpot Developer API Key Sensitive Information Exposure
- CVE-2024-31077 SQL injection in Forminator
Sources
Also known as GHSA-ppfv-9rmx-jjrq.