medium5.3
CVE-2026-54685
FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel
Impact
FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to version 1.3.2-beta, the `/api/auth/login` authentication endpoint does not execute in constant time. When a non-existent username is supplied, the server returns a `401`/`403` response almost immediately. When a valid username is provided, the server performs a bcrypt password comparison, causing a measurable delay in the response time. Version 1.3.2-beta patches the issue.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/gtsteffaniak/filebrowser/backend | < 0.0.0-20260317230626-af08800667b8 | 0.0.0-20260317230626-af08800667b8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-7789-65hx-f26w
- https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26w
- https://github.com/gtsteffaniak/filebrowser/commit/af08800667b874620edc6f44c3e2e64fec7abd85
- https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.2-beta