MSRC-CVE-2026-50364 — Windows Backup Service Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Security updates
10.0.19044.7548 — https://support.microsoft.com/help/5099539
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.28000.2525 — https://support.microsoft.com/help/5101649

Vulnerabilities 1

High 7.3

CVE-2026-50364

Windows Backup Service Elevation of Privilege Vulnerability

Improper link resolution before file access ('link following') in Windows Server Backup allows an authorized attacker to elevate privileges locally.

Microsoft Windows 10 Version 21H2 Windows 10 Version 22H2 Windows 11 Version 24H2 Windows

Jul 14, 2026

Revision history

2026-07-14 #1
Information published.

References

CVE-2026-50364 Windows Backup Service Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50364
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss