CVE-2026-54685

MEDIUM5.3

FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

Published Jul 20, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/gtsteffaniak/filebrowser/commit/af08800667b874620edc6f44c3e2e64fec7abd85

WEB

https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.2-beta

WEB

https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26w

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-54685

CVSS Analysis

CVSS v3.1

5.3