TI-2026-40189 Aliases CVE-2026-55667 GHSA-fmm7-x4gx-8jhr

Path traversal in filebrowser

HIGH 69CWE-22Published 2026-06-25 · Updated 2026-06-26

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.16, a scoped, non-admin File Browser user holding only the Create permission can delete arbitrary files outside their scope (other tenants' data, and the application's own database) via the upload failure-cleanup path. ScopedFs.RemoveAll is the one dereferencing operation that skips the symlink guard every other method enforces. The direct-upload handler runs RemoveAll on the user-controlled path during failed-upload cleanup, gated only by Perm.Create. If an escaping directory symlink already exists inside the user's scope, an authenticated create-only user can delete an out-of-scope target, bypassing both the ScopedFs boundary and the Perm.Delete gate. This vulnerability is fixed in 2.63.16.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00494 42nd percentileScored 2026-11-07

Fix Fixed filebrowser (filebrowser): 2.63.16github.com/filebrowser/filebrowser/v2 (Go): 2.63.16

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

Vendor	Product	Affected versions	Fixed in	Status	Source
filebrowser	filebrowser	before 2.63.16	2.63.16	Patch available	CNA
—	github.com/filebrowser/filebrowser/v2 (Go)	before 2.63.16	2.63.16	Patch available	GHSA-fmm7-x4gx-8jhr

filebrowser Vendorfilebrowser Affected before 2.63.16 Fixed in 2.63.16 Patch available CNA
github.com/filebrowser/filebrowser/v2 (Go) Vendor— Affected before 2.63.16 Fixed in 2.63.16 Patch available GHSA-fmm7-x4gx-8jhr

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 2.63.16
Fix · GHSA-fmm7-x4gx-8jhr github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.63.16 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55667
2026-10-03 Alias added: GHSA-fmm7-x4gx-8jhr

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-55667

Other 3

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