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TI-2026-44924 Aliases CVE-2026-62843GHSA-83xp-526h-j3ww

File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)

Priority MEDIUM 63CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
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 is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. From 2.63.6 to 2.63.16, File Browser's archive builder uses strings.ReplaceAll(nameInArchive, "\", "/"), which turns a POSIX filename such as ..\..\evil.sh into the archive entry ../../evil.sh, allowing a user with upload permission to plant a backslash-named file that escapes the extraction directory when another user downloads and extracts the generated zip or tar archive. This issue is fixed in version 2.63.17.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00391 33rd percentileScored 2026-11-07
Fix Fixed filebrowser (filebrowser): 2.63.17github.com/filebrowser/filebrowser/v2 (Go): 2.63.17

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

VendorProductAffected versionsFixed inStatusSource
filebrowserfilebrowser2.63.6 to before 2.63.172.63.17Patch availableCNA
—github.com/filebrowser/filebrowser/v2 (Go)2.63.6 to before 2.63.172.63.17Patch availableGHSA-83xp-526h-j3ww
  • filebrowser Vendorfilebrowser Affected 2.63.6 to before 2.63.17 Fixed in 2.63.17 Patch available CNA
  • github.com/filebrowser/filebrowser/v2 (Go) Vendor— Affected 2.63.6 to before 2.63.17 Fixed in 2.63.17 Patch available GHSA-83xp-526h-j3ww

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*——filebrowser
  • cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* Versions — — ·filebrowser

Remediation

  • Fix · CNA filebrowser (filebrowser) Fixed in 2.63.17
  • Fix · GHSA-83xp-526h-j3ww github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.63.17 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-62843
  2. 2026-10-03 Alias added: GHSA-83xp-526h-j3ww

References

Advisory 1

Other 4

  • 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