CVE-2026-54685 MEDIUM

CVE-2026-54685: FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

Vendor Gtsteffaniak

Product filebrowser

Weakness CWE-208

Published July 20, 2026

Last update July 21, 2026

View on NVD All CVEs

CVSS base score

5.3/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality Low

Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 20, 2026 CVE published

July 21, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-54685 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/208.html AskarLabs — CWE-208 write-up Observable Timing Discrepancy