CVE-2026-54685CWE-208

FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

Medium · published July 20, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
39.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00468 · 39.6th percentile
Weakness
CWE-208 · Observable Timing Discrepancy
Published
2026-07-20T14:17Z
EPSS history
Timeline
  • 20 JUL 14:17Z
    FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel
    cvelistv5