CVE-2026-54685

FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

Published Jul 20, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-7789-65hx-f26w FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Gtsteffaniak
Gtsteffaniak filebrowser
Vendors & Products Gtsteffaniak
Gtsteffaniak filebrowser
Type Values Removed Values Added
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.
Title FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel
Weaknesses CWE-208
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 21, 2026, 3:31 PM
Reserved
Jun 15, 2026, 10:53 PM
Status
Deferred
Published
Jul 20, 2026, 3:16 PM
Modified
Oct 24, 2026, 8:10 PM