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TI-2026-39682 Aliases CVE-2026-54910GHSA-vvp7-h4fj-m28w

FileBrowser Quantum's path traversal issue in subtitle handler allows any authenticated user to read arbitrary files

Priority HIGH 67CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to version 1.4.3-beta, the `subtitlesHandler` endpoint (`GET /api/media/subtitles`) accepts two user-controlled query parameters: `path` and `name`, both of which are used in filesystem operations without sanitization, creating two independent path traversal vectors. The primary vector is the `path` parameter: it is passed directly to `idx.GetRealPath()` without calling `SanitizeUserPath()`, allowing an attacker to escape the storage root and set `parentDir` to any directory on the host. No existing anchor file is required. The secondary vector is the `name` parameter: it is joined with `parentDir` via `filepath.Join(parentDir, name)` without stripping directory components, allowing traversal relative to any resolved `parentDir`. Any authenticated user (regardless of role or permissions) can exploit either vector to read any text file readable by the server process, including `/etc/passwd`, SSH keys, database credentials, and JWT signing keys. Version 1.4.3-beta patches the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00377 31st percentileScored 2026-11-07
Fix Fixed filebrowser (gtsteffaniak): 1.4.3-betagithub.com/gtsteffaniak/filebrowser/backend (Go): 0.0.0-20260608182036-f3f4bbe80cb5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
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 1.4.3-beta1.4.3-betaPatch availableCNA
—github.com/gtsteffaniak/filebrowser/backend (Go)before 0.0.0-20260608182036-f3f4bbe80cb50.0.0-20260608182036-f3f4bbe80cb5Patch availableGHSA-vvp7-h4fj-m28w
  • filebrowser Vendorgtsteffaniak Affected before 1.4.3-beta Fixed in 1.4.3-beta Patch available CNA
  • github.com/gtsteffaniak/filebrowser/backend (Go) Vendor— Affected before 0.0.0-20260608182036-f3f4bbe80cb5 Fixed in 0.0.0-20260608182036-f3f4bbe80cb5 Patch available GHSA-vvp7-h4fj-m28w

Remediation

  • Fix · CNA filebrowser (gtsteffaniak) Fixed in 1.4.3-beta
  • Fix · GHSA-vvp7-h4fj-m28w github.com/gtsteffaniak/filebrowser/backend (Go) Fixed in 0.0.0-20260608182036-f3f4bbe80cb5 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54910
  2. 2026-10-03 Alias added: GHSA-vvp7-h4fj-m28w

References

Advisory 1

Other 5

  • 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