CVE-2020-37238 CMS Made Simple 2.2.15 Stored XSS via SVG File Upload
Authenticated users can inject malicious scripts via SVG uploads, leading to session hijacking and cookie theft for other users.
- 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-2020-37238?
CVE-2020-37238 is a medium-severity cross-site scripting vulnerability in Cmsmadesimple CMS Made Simple, published on 16 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
CMS Made Simple 2.2.15 contains a stored cross-site scripting vulnerability that allows authenticated users with Content Manager access to inject malicious scripts through SVG file uploads. Attackers can upload SVG files containing embedded JavaScript to the file manager, which executes when other authenticated users access the uploaded file, enabling cookie theft and session hijacking.
Weakness: CWE-79
Which versions are affected by CVE-2020-37238?
How do I fix CVE-2020-37238?
No fix has been published for CVE-2020-37238 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-2020-37238 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37238 exists.
Sources
Also known as GHSA-r549-hx7w-7xr9.