Windows Hotpatch Monitoring Service Elevation of Privilege Vulnerability

Out-of-bounds write in Windows Hotpatch Monitoring Service allows an authorized attacker to elevate privileges locally.

Read the vendor bulletin Get alerts for Windows Server 2025 (Server Core installation)

7.8CVSS out of 10High severity

Scope

What the vendor says is affected

Windows Server 2025 (Server Core installation)
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 version 26H1 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Windows Server 2025

Versions the vendor lists as fixed

10.0.26100.32995
10.0.26200.8655
10.0.26100.8655
10.0.28000.2269

Next step

What the vendor recommends

Install KB5094125. Install KB5094126. Install KB5095051.

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

Jun 9, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Jun 30, 2026 at 7:00 AM UTC
Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
Sep 28, 2026 at 11:20 AM UTC
Added to SecurityAlert
We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-42910View CVSS, KEV, EPSS, and threat context

Source

Start with the vendor's bulletin

SecurityAlert organizes the fields the vendor published. The original bulletin remains the source of record for affected versions, fixes, and later changes.

Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-42910
Last source check: Sep 28, 2026 at 11:20 AM UTC

Open the official bulletin How SecurityAlert builds this record

Your environment

Check the systems you actually run

A vendor advisory can tell you what may be affected. It cannot tell you whether that product and version are installed in your environment.

Confirm the product and installed version.
Read the vendor's prerequisites and exceptions.
Test the update or mitigation through your normal change process.

Watch Windows Server 2025 (Server Core installation)

Keep following

Get new Microsoft Security Response Center advisories

Use the vendor-specific RSS feed or set up alerts for a product your team relies on.

Follow this vendor's RSS feed

What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

Related advisories from Microsoft Security Response Center

drm/i915: Fix memory leak in query_perf_config_list()

s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap

wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi

drm/amd/pm: bound pp_dpm_set_pp_table() memcpy

wifi: mac80211: ibss: wait for in-flight TX on disconnect

SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry