File Browser has an access rule bypass via HasPrefix without trailing separator in path matching
Priority HIGH 67CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · 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 2.63.1, the Matches() function in rules/rules.go uses strings.HasPrefix() without a trailing directory separator when matching paths against access rules. A rule for /uploads also matches /uploads_backup/, granting or denying access to unintended directories. This vulnerability is fixed in 2.63.1.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00407 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed filebrowser (filebrowser): 2.63.1github.com/filebrowser/filebrowser/v2 (Go): 2.63.1
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| filebrowser | filebrowser | before 2.63.1 | 2.63.1 | Patch available | CNA |
| — | github.com/filebrowser/filebrowser/v2 (Go) | before 2.63.1 | 2.63.1 | Patch available | GHSA-5q48-q4fm-g3m6 |
- filebrowser Vendorfilebrowser Affected before 2.63.1 Fixed in 2.63.1 Patch available CNA
- github.com/filebrowser/filebrowser/v2 (Go) Vendor— Affected before 2.63.1 Fixed in 2.63.1 Patch available GHSA-5q48-q4fm-g3m6
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* | before 2.63.1 | Vulnerable | filebrowser |
- cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* Versions before 2.63.1 Vulnerable ·filebrowser
Remediation
- Fix · CNA filebrowser (filebrowser) Fixed in 2.63.1
- Fix · GHSA-5q48-q4fm-g3m6 github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.63.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-35605
- 2026-10-03 Alias added: GHSA-5q48-q4fm-g3m6
References
More Filebrowser vulnerabilities
- TI-2026-25251 File Browser Self Registration Grants Any User Admin Access When Default Permissions Include Admin CVSS 4.0CRITICAL 10.0
- 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
- TI-2025-33000 File Browser vulnerable to command execution allowlist bypass CVSS 3.1HIGH 8.1
- TI-2026-23759 FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse) CVSS 3.1HIGH 8.9
- TI-2023-20699 A cross-site scripting (XSS) vulnerability in FileBrowser before v2.23.0 allows an… CVSS 3.1CRITICAL 9.0
Sources
- CVE-2026-35605 · CVE Program
- CVE-2026-35605 · NVD
- FIRST EPSS
- GHSA-5q48-q4fm-g3m6 · GitHub Advisory Database · CC BY 4.0
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