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TI-2026-39506 Aliases CVE-2026-54685GHSA-7789-65hx-f26w

FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

Priority MEDIUM 63CWE-208Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-208.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00338 27th percentileScored 2026-11-07
Fix Fixed filebrowser (gtsteffaniak): 1.3.2-betagithub.com/gtsteffaniak/filebrowser/backend (Go): 0.0.0-20260317230626-af08800667b8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gtsteffaniakfilebrowserbefore 1.3.2-beta1.3.2-betaPatch availableCNA
—github.com/gtsteffaniak/filebrowser/backend (Go)before 0.0.0-20260317230626-af08800667b80.0.0-20260317230626-af08800667b8Patch availableGHSA-7789-65hx-f26w
  • filebrowser Vendorgtsteffaniak Affected before 1.3.2-beta Fixed in 1.3.2-beta Patch available CNA
  • github.com/gtsteffaniak/filebrowser/backend (Go) Vendor— Affected before 0.0.0-20260317230626-af08800667b8 Fixed in 0.0.0-20260317230626-af08800667b8 Patch available GHSA-7789-65hx-f26w

Remediation

  • Fix · CNA filebrowser (gtsteffaniak) Fixed in 1.3.2-beta
  • Fix · GHSA-7789-65hx-f26w github.com/gtsteffaniak/filebrowser/backend (Go) Fixed in 0.0.0-20260317230626-af08800667b8 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54685
  2. 2026-10-03 Alias added: GHSA-7789-65hx-f26w

References

Other 4

  • TI-2026-36047 FileBrowser Quantum: Path Traversal in public share PATCH allows file ops outside shared directory CVSS 4.0CRITICAL 9.3
  • TI-2026-32454 FileBrowser Quantum: Unauthenticated Path Traversal in Public Share Delete Allows Arbitrary File Deletion CVSS 3.1CRITICAL 9.1
  • TI-2026-81497 Symlink following in FileBrowser Quantum exposes out-of-scope files CVSS 3.1HIGH 8.6
  • TI-2026-23759 FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse) CVSS 3.1HIGH 8.9
  • TI-2026-23758 FileBrowser Quantum Incomplete Remediation of CVE-2026-27611: Password-Protected Share Bypass via /public/api/share/info CVSS 3.1HIGH 7.5
  • TI-2026-21997 FileBrowser Quantum: Password Protection Not Enforced on Shared File Links CVSS 4.0HIGH 7.1
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences