Authorization bypass through user-controlled key in Serv-U FTP Server - CVE-2026-28314
Published: July 27, 2026
Vulnerability identifier: #VU139623
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-28314
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to take over accounts.
The vulnerability exists due to improper access control in object reference handling when processing authenticated requests. A remote privileged user can access direct object references to take over accounts.
The impact is lower in Windows deployments.
Affected software
Serv-U FTP Server
How to mitigate CVE-2026-28314
Install security update from vendor's website.
Serv-U FTP Server - update to 2026.3