FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54685
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-20 15:16:43 UTC
Updated2026-07-22 20:50:36 UTC
DescriptionFileBrowser 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

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

EPSS: 0.002700000 probability, percentile 0.189130000 (date 2026-07-22)

Problem Types: CWE-208 | CWE-208 CWE-208: Observable Timing Discrepancy

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gtsteffaniak Filebrowser affected < 1.3.2-beta Not specified

References

ReferenceSourceLinkTags
github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26w 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.2-beta [email protected] github.com
github.com/gtsteffaniak/filebrowser/commit/af08800667b874620edc6f44c3e2e... [email protected] github.com
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