CVE-2025-66403 FileRise Vulnerable to Stored XSS via SVG Upload

Medium 4.6 Published 1 Dec 2025 Updated 2 Dec 2025

Attackers can execute arbitrary JavaScript in victim browsers by uploading malicious SVG files to the FileRise web-based file manager.

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-2025-66403?

CVE-2025-66403 is a medium-severity cross-site scripting vulnerability in error311 FileRise, published on 1 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

FileRise is a self-hosted web-based file manager with multi-file upload, editing, and batch operations. Prior to 2.2.3, a stored cross-site scripting (XSS) vulnerability exists in the Filerise application due to improper handling of uploaded SVG files. The application accepts user-supplied SVG uploads without sanitizing or restricting embedded script content. When a malicious SVG containing inline JavaScript or event-based payloads is uploaded, it is later rendered directly in the browser whenever viewed within the application. Because SVGs are XML-based and allow scripting, they execute in the origin context of the application, enabling full stored XSS. This vulnerability is fixed in 2.2.3.

Weakness: CWE-79

Which versions are affected by CVE-2025-66403?

It affects 1 product.

Products include Filerise Filerise.

How do I fix CVE-2025-66403?

No fix has been published for CVE-2025-66403 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-2025-66403 being exploited?

There is no known exploitation of CVE-2025-66403 in the wild and no public exploit code.

Sources

Also known as GHSA-qrcv-vjvf-fr29.