CVE-2026-54685

MEDIUM 5.3

FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-208
Vendor	gtsteffaniak
Product	filebrowser
Published	Jul 20, 2026
Last Updated	Jul 20, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

gtsteffaniak / filebrowser

< 1.3.2-beta

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26w github.com: https://github.com/gtsteffaniak/filebrowser/commit/af08800667b874620edc6f44c3e2e64fec7abd85 github.com: https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.2-beta