Improper access control in Serv-U FTP Server - CVE-2026-28307
Published: July 27, 2026
Vulnerability identifier: #VU139621
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-28307
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: SolarWinds
Affected software:
Serv-U FTP Server
Serv-U FTP Server
Detailed vulnerability description
The vulnerability allows a remote user to escalate privileges.
The vulnerability exists due to improper access control in group membership management when handling user group assignments. A remote privileged user can elevate a domain user group into an administrator group to escalate privileges.
The impact is lower in Windows deployments.
How to mitigate CVE-2026-28307
Install security update from vendor's website.