SB2026062987 - Multiple vulnerabilities in FileBrowser

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026062987

SB2026062987 - Multiple vulnerabilities in FileBrowser

Published: June 29, 2026

Security Bulletin ID SB2026062987
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Link following (CVE-ID: CVE-2026-55667)

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote user to delete arbitrary files outside the intended scope and cause a denial of service.

The vulnerability exists due to improper link resolution before file access in the upload failure-cleanup path when handling a crafted upload request to a path containing a symlinked ancestor. A remote user can send a specially crafted upload request to delete out-of-scope files and directories.

Exploitation requires a pre-existing escaping directory symlink inside the user's scope. If the target is a directory, deletion is recursive.


2) Link following (CVE-ID: CVE-2026-55668)

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to create files outside their intended scope.

The vulnerability exists due to improper link resolution before file access in ScopedFs when handling write and create operations through a dangling symlink. A remote user can send a specially crafted write request targeting a dangling symlink to create files outside their intended scope.

Exploitation requires Create and Modify permissions and a dangling symlink to a non-existent out-of-scope target to be present inside the user's scope.


Remediation

Install update from vendor's website.

References