CVE-2021-47732 CMSimple 5.2 Stored Cross-Site Scripting via Filebrowser External Input
Attackers can inject malicious JavaScript into the Filebrowser External input field, leading to persistent script execution when users interact with specific tabs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-47732?
CVE-2021-47732 is a medium-severity cross-site scripting vulnerability in CMSimple, published on 23 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
CMSimple 5.2 contains a stored cross-site scripting vulnerability in the Filebrowser External input field that allows attackers to inject malicious JavaScript. Attackers can place unfiltered JavaScript code that executes when users click on Page or Files tabs, enabling persistent script injection.
Weakness: CWE-79
Which versions are affected by CVE-2021-47732?
It affects 1 product.
Products include Cmsimple Cmsimple.
How do I fix CVE-2021-47732?
No fix has been published for CVE-2021-47732 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-2021-47732 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47732 exists.
Other vulnerabilities in CMSimple
- CVE-2021-43741 Path traversal in n/a
- CVE-2024-57548 Missing authorization in n/a
- CVE-2021-47734 CMSimple 5.4 Authenticated Local File Inclusion Remote Code Execution
- CVE-2021-47735 CMSimple 5.4 Authenticated Remote Code Execution via Template Editing
- CVE-2024-58280 CMSimple 5.15 Remote Command Execution via Extensions Configuration
Sources
Also known as GHSA-48vh-4wjm-4mch.