# gtsteffaniak FileBrowser missing rate limiting in login endpoint

Source: https://junglewise.ai/threats/gtsteffaniak-filebrowser-missing-rate-limiting-in-login-endpoint-ae00b83e  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25. Updated: 2026-06-25  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 6.5 · Published 2026-06-25

FileBrowser, a web-based file management utility, contains a security flaw in its login system. The application fails to limit the number of login attempts, allowing an attacker to try thousands of passwords against a user account without being blocked. This could lead to unauthorized access to files and sensitive data, especially since the software's default settings allow for very short, simple passwords.

Technologies: [github.com/gtsteffaniak/filebrowser (Go)](https://junglewise.ai/threats/technologies/github-com-gtsteffaniak-filebrowser). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Medium severity, with a CVSS score of 6.5, published 25 June 2026.

**Which products and versions are affected?** github.com/gtsteffaniak/filebrowser (Go) < 0.0.0-20260522161427-fa5abc8c67f3a.

**Is there a fix for This vulnerability?** A patch was published on 2026-05-22: Fix committed to repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is This vulnerability attacked?** It is attacked over the network, in a network appliance.

**Am I affected?** Check whether you run github.com/gtsteffaniak/filebrowser (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The `/api/auth/login` endpoint in FileBrowser does not implement rate limiting, account lockout, or progressive backoff for failed authentication attempts. An attacker can perform high-frequency automated login attempts over the network without authentication. This vulnerability is exacerbated by a weak default password policy (minimum 5 characters) and can be combined with username enumeration timing attacks to identify and compromise valid accounts. The issue was addressed in version 0.0.0-20260522161427-fa5abc8c67f3a.

## Affected products

- gtsteffaniak FileBrowser < 0.0.0-20260522161427-fa5abc8c67f3a

## Timeline

- 2026-05-22: patched: Fix committed to repository
- 2026-06-25: advisory: GitHub Advisory published

## References

- [https://api.github.com/users/mdcoxe](https://api.github.com/users/mdcoxe)
- [https://github.com/mdcoxe](https://github.com/mdcoxe)
- [https://api.github.com/users/mdcoxe/gists%7B/gist_id%7D](https://api.github.com/users/mdcoxe/gists%7B/gist_id%7D)
- [https://api.github.com/users/mdcoxe/repos](https://api.github.com/users/mdcoxe/repos)
- [https://avatars.githubusercontent.com/u/72583004?v=4](https://avatars.githubusercontent.com/u/72583004?v=4)
- [https://api.github.com/users/mdcoxe/events%7B/privacy%7D](https://api.github.com/users/mdcoxe/events%7B/privacy%7D)

## Related threats

- [FileBrowser Quantum information disclosure to unauthenticated users](https://junglewise.ai/threats/cve-2026-46410-filebrowser-quantum-information-disclosure-to-unauthenticated)
- [GO-2026-5776 - FileBrowser: Missing Rate Limiting on Authentication Endpoint Enables Brute Force Attacks in…](https://junglewise.ai/threats/go-2026-5776-filebrowser-missing-rate-limiting-on-authentication-b2b87eb2)
- [GO-2026-5511 - FileBrowser Vulnerable to Stored XSS via SVG File in Public Share (Missing CSP Header) in…](https://junglewise.ai/threats/go-2026-5511-filebrowser-vulnerable-to-stored-xss-via-svg-file-in-f1d3c87e)
- [gtsteffaniak FileBrowser Quantum path traversal in public share delete](https://junglewise.ai/threats/cve-2026-44542-gtsteffaniak-filebrowser-quantum-path-traversal-in-public-share)
- [FileBrowser Vulnerable to Stored XSS via SVG File in Public Share (Missing CSP Header)](https://junglewise.ai/threats/filebrowser-vulnerable-to-stored-xss-via-svg-file-in-public-share-e21c2552)