Link following in FileBrowser - CVE-2026-55667
Published: June 29, 2026
Vulnerability identifier: #VU135763
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-55667
CWE-ID: CWE-59
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 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.
How to mitigate CVE-2026-55667
Install security update from vendor's website.