TI-2026-39020 Aliases CVE-2026-54091 GHSA-j9jx-hp4c-ghhh

File Browser: Incorrect access control in public directory shares via rule path rebasing

LOW 39CWE-863Published 2026-06-25 · Updated 2026-06-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
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-863.

Summary

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, File Browser's public share handlers rebase the share owner's filesystem root to the shared directory and then evaluate descendant paths against the owner's global and per-user rules using the rebased relative path instead of the original path relative to the owner's scope. As a result, an attacker who knows a public directory share URL can access files and subdirectories that the owner explicitly blocked with rules, as long as those blocked paths are located underneath the shared directory. In the simplest case this is an unauthenticated information disclosure through `GET /api/public/share/*` and `GET /api/public/dl/*`. This vulnerability is fixed in 2.63.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00516 44th percentileScored 2026-11-07

Fix Fixed filebrowser (filebrowser): 2.63.6github.com/filebrowser/filebrowser/v2 (Go): 2.63.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
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

Vendor	Product	Affected versions	Fixed in	Status	Source
filebrowser	filebrowser	before 2.63.6	2.63.6	Patch available	CNA
—	github.com/filebrowser/filebrowser/v2 (Go)	before 2.63.6	2.63.6	Patch available	GHSA-j9jx-hp4c-ghhh

filebrowser Vendorfilebrowser Affected before 2.63.6 Fixed in 2.63.6 Patch available CNA
github.com/filebrowser/filebrowser/v2 (Go) Vendor— Affected before 2.63.6 Fixed in 2.63.6 Patch available GHSA-j9jx-hp4c-ghhh

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:filebrowser:filebrowser::::::::	—	—	filebrowser

cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* Versions — — ·filebrowser

Remediation

Fix · CNA filebrowser (filebrowser) Fixed in 2.63.6
Fix · GHSA-j9jx-hp4c-ghhh github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.63.6 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-54091
2026-10-03 Alias added: GHSA-j9jx-hp4c-ghhh

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-54091

Other 4

TI-2026-25251 File Browser Self Registration Grants Any User Admin Access When Default Permissions Include Admin CVSS 4.0CRITICAL 10.0
TI-2026-51065 filebrowser through 2.63.16 Privilege Escalation via Signup CVSS 4.0CRITICAL 9.3
TI-2026-39018 File Browser: Authentication Bypass via Proxy Auth Header Forgery CVSS 3.1CRITICAL 9.1
TI-2026-39017 File Browser: Command Injection via Authentication Hook Shell Substitution (Pre-Authentication RCE) CVSS 4.0CRITICAL 9.3
TI-2026-23305 File Browser: TUS Delete Endpoint Bypasses Delete Permission Check CVSS 3.1CRITICAL 9.1
TI-2026-26777 File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution CVSS 3.1CRITICAL 9.8

See all 64 →

Sources

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