CVE-2025-52902 File Browser has Stored Cross-Site Scripting vulnerability
Attackers can execute arbitrary JavaScript in victims' browsers by uploading malicious Markdown files, potentially leading to session hijacking or data theft.
- 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
- Available
What is CVE-2025-52902?
CVE-2025-52902 is a high-severity cross-site scripting vulnerability in filebrowser, published on 26 Jun 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
File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. The Markdown preview function of File Browser prior to v2.33.7 is vulnerable to Stored Cross-Site-Scripting (XSS). Any JavaScript code that is part of a Markdown file uploaded by a user will be executed by the browser. Version 2.33.7 contains a fix for the issue.
Which versions are affected by CVE-2025-52902?
6 open source packages ship an affected version, including github.com/filebrowser/filebrowser and github.com/filebrowser/filebrowser/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/filebrowser/filebrowser Go | All versions | None |
github.com/filebrowser/filebrowser Go | All versions to 1.11.0 | None |
github.com/filebrowser/filebrowser Go | All versions to 1.11.0 | None |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.33.7 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.33.7 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.33.7 |
Products include Filebrowser Filebrowser.
How do I fix CVE-2025-52902?
Upgrade to a fixed version.
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-2025-52902 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-52902 exists.
Other vulnerabilities in filebrowser
- CVE-2026-32760 File Browser Self Registration Grants Any User Admin Access When Default Permissions Include Admin
- CVE-2026-29188 File Browser: TUS Delete Endpoint Bypasses Delete Permission Check
- CVE-2023-39612 Cross-site scripting in n/a
- CVE-2026-30934 FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
- CVE-2021-46398 Cross-Site Request Forgery in Filebrowser
Sources
Also known as GHSA-4wx8-5gm2-2j97, GO-2025-3784.