File Browser: ScopedFs follows a dangling symlink on write, letting a scoped user create files outside their scope
Priority MEDIUM 61CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
File Browser provides a web file managing interface. Prior to 2.63.16, ScopedFs validates the nearest existing ancestor of a dangling symlink as in scope and then follows the symlink during file creation, allowing an authenticated user with Create and Modify permissions to create attacker-controlled files outside the user's scope. This issue is fixed in version 2.63.16.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00378 31st 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-8wc8-hf36-mjh9 |
- 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-8wc8-hf36-mjh9
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-8wc8-hf36-mjh9 github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.63.16 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55668
- 2026-10-03 Alias added: GHSA-8wc8-hf36-mjh9
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-2026-51065 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
Sources
- CVE-2026-55668 · CVE Program
- CVE-2026-55668 · NVD
- FIRST EPSS
- GHSA-8wc8-hf36-mjh9 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences