Improper access control in FileBrowser - CVE-2026-35605
Published: April 8, 2026
Vulnerability identifier: #VU125402
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-35605
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: File Browser
Affected software:
FileBrowser
FileBrowser
Detailed vulnerability description
The vulnerability allows a remote user to bypass intended access restrictions and access files in unintended sibling directories.
The vulnerability exists due to improper access control in the Matches() function in rules/rules.go when matching paths against access rules using strings.HasPrefix() without a trailing directory separator. A remote user can request a path that shares a common prefix with an allowed directory to bypass intended access restrictions and access files in unintended sibling directories.
The issue affects non-regex path rules, and rule evaluation uses last-match-wins semantics.
How to mitigate CVE-2026-35605
Install security update from vendor's website.