#VU121246 Permissions, Privileges, and Access Controls in Windows Server and Windows - CVE-2026-20817
Published: January 13, 2026 / Updated: February 27, 2026
Vulnerability identifier: #VU121246
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2026-20817
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vulnerable software:
Windows Server
Windows
Windows Server
Windows
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in Windows Error Reporting Service, which leads to security restrictions bypass and privilege escalation.
Remediation
Install updates from vendor's website.