File Browser: Path traversal in download-as-zip/tar via Windows-style backslash separators in stored filenames
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · 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 2.63.6, filebrowser builds the download-as-zip / download-as-tar archive entry names with filepath.ToSlash, which on a Linux host is a no-op for backslashes (\ is only a path separator on Windows). A file whose name contains Windows-style traversal is accepted by the resource handlers, stored on the Linux filesystem with a literal backslash name, and then emitted verbatim as the archive entry name. Windows extractors interpret \ as a path separator and write the extracted file outside the extraction directory — arbitrary file write on the victim who downloads and extracts the archive. This vulnerability is fixed in 2.63.6.
Why it matters now
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 2.63.6 | 2.63.6 | Patch available | CNA |
| — | github.com/filebrowser/filebrowser/v2 (Go) | before 2.63.6 | 2.63.6 | Patch available | GHSA-gxjx-7m74-hcq8 |
| — | github.com/filebrowser/filebrowser (Go) | up to 1.11.0 | — | No fix listed | GHSA-gxjx-7m74-hcq8 |
- 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-gxjx-7m74-hcq8
- github.com/filebrowser/filebrowser (Go) Vendor— Affected up to 1.11.0 Fixed in — No fix listed GHSA-gxjx-7m74-hcq8
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-gxjx-7m74-hcq8 github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.63.6 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-54093
- 2026-10-03 Alias added: GHSA-gxjx-7m74-hcq8
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-2026-54093 · CVE Program
- CVE-2026-54093 · NVD
- FIRST EPSS
- GHSA-gxjx-7m74-hcq8 · 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