Vulnerability · Published Jul 20, 2026 · Assigned by GitHub_M
CVE-2026-54685FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel
Medium 5.3
In plain English
A medium-severity security flaw in filebrowser from gtsteffaniak. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/gtsteffaniak/filebrowser/backend | 0.0.0-20260317230626-af08800667b8 | GHSA-7789-65hx-f26w |
| Go | github.com/gtsteffaniak/filebrowser/backend | 0.0.0-20260317230626-af08800667b8 | GO-2026-4820 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| gtsteffaniak | filebrowser | < 1.3.2-beta |
Weakness: CWE-208 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N