A severe Elevation of Privilege vulnerability, identified as CVE-2026-62721 with a CVSS score of 9.8, exists in the Windows User-Mode Power Service (UMPS) that allows attackers to gain deeper access into compromised systems. This flaw was exploited by attackers to introduce functionality breakdowns across enterprise environments and resolve major Remote Desktop Services failures, Microsoft Management Console instability, and File Explorer issues. The emergency Windows 11 KB5129195 update addresses this vulnerability and delivers crucial privilege elevation protections to keep operating systems secure. Additionally, the patch resolves system instability introduced by the recent September patch, persistent Linux folder sharing issues in Hyper-V environments, and multichannel USB audio failures, while introducing vital security protections for system stability and operating system security.
We recommend you refer below mention link to apply patches: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update[/subscribe_to_unlock_form]
A severe Elevation of Privilege vulnerability, identified as CVE-2026-62721 with a CVSS score of 9.8, exists in the Windows User-Mode Power Service (UMPS) that allows attackers to gain deeper access into compromised systems. This flaw was exploited by attackers to introduce functionality breakdowns across enterprise environments and resolve major Remote Desktop Services failures, Microsoft Management Console instability, and File Explorer issues. The emergency Windows 11 KB5129195 update addresses this vulnerability and delivers crucial privilege elevation protections to keep operating systems secure. Additionally, the patch resolves system instability introduced by the recent September patch, persistent Linux folder sharing issues in Hyper-V environments, and multichannel USB audio failures, while introducing vital security protections for system stability and operating system security.
We recommend you refer below mention link to apply patches: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update[emaillocker id="1283"]
The following reports contain further technical details:
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