TI-2026-51061 Aliases CVE-2026-72835 GHSA-8jx5-5rq8-69m2

filebrowser before v2.63.21 Access Rule Bypass via Path Canonicalization

HIGH 68CWE-41Published 2026-08-14 · Updated 2026-08-14

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

filebrowser versions before v2.63.21 fail to canonicalize paths before evaluating access rules, allowing authenticated users to bypass administrator-defined deny rules using case-variant or backslash-separated paths. Attackers can request files with alternate path representations that match no rule but resolve to the same filesystem object, gaining unauthorized access to denied files within their scope.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.005 43rd percentileScored 2026-11-07

Fix Fixed filebrowser (filebrowser): 2.63.21

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

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 2.63.21	2.63.21	Patch available	CNA

filebrowser Vendorfilebrowser Affected before 2.63.21 Fixed in 2.63.21 Patch available CNA

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 2.63.21

Timeline

2026-10-02 Threatist record created from CVE-2026-72835
2026-10-03 Alias added: GHSA-8jx5-5rq8-69m2

References

Advisory 1

GitHub Security Advisory (GHSA-fgm5-pw99-w2p7)

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