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TI-2026-44791 Aliases CVE-2026-62685GHSA-7rc3-g7h6-22m7

File Browser: Colliding username normalization gives two users the same home directory

Priority HIGH 70CWE-647Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
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. Prior to 2.63.17, File Browser builds new user scopes from usernames passed through cleanUsername() when Signup=true and CreateUserDir=true, but the many-to-one normalization can collapse usernames such as team/one, team one, and team-one to the same home directory without checking whether the resulting scope is already taken, allowing a second registrant to gain full read and write access to another user's files. This issue is fixed in version 2.63.17.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00553 46th 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
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
filebrowserfilebrowserbefore 2.63.172.63.17Patch availableCNA
—github.com/filebrowser/filebrowser/v2 (Go)before 2.63.172.63.17Patch availableGHSA-7rc3-g7h6-22m7
  • filebrowser Vendorfilebrowser Affected before 2.63.17 Fixed in 2.63.17 Patch available CNA
  • github.com/filebrowser/filebrowser/v2 (Go) Vendor— Affected before 2.63.17 Fixed in 2.63.17 Patch available GHSA-7rc3-g7h6-22m7

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-7rc3-g7h6-22m7 github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.63.17 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-62685
  2. 2026-10-03 Alias added: GHSA-7rc3-g7h6-22m7

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