Input validation error in FileBrowser - CVE-2026-32759
Published: June 8, 2026
Vulnerability identifier: #VU133479
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-32759
CWE-ID: CWE-20
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 trigger configured after_upload hooks prematurely.
The vulnerability exists due to improper input validation in the TUS resumable upload handler in http/tus_handlers.go when processing a negative Upload-Length header during upload registration and PATCH handling. A remote user can send a crafted upload request sequence with a negative Upload-Length value to trigger configured after_upload hooks prematurely.
Exploitation requires upload permission, and the impact is amplified when exec hooks are enabled.
How to mitigate CVE-2026-32759
Install security update from vendor's website.