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Microsoft Security Response CenterCVE-2026-70583

Windows Core Messaging Elevation of Privilege Vulnerability

Severity not listedVendor CVSS 7.8 / 10 1 CVE Published Sep 8, 2026 at 7:00 AM UTC

Summary

Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges locally.

Products covered

A separate affected-products list was not included in the collected bulletin.

Remediation

Install KB5122876. Install KB5122882. Install KB5122878. Install KB5122871. Install KB5124008. Install KB5122880. Install KB5124012. Install KB5123099.

CVEs in this advisory 1

CVE-2026-70583
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Severity changed from High to Unknown.
    • Removed affected products: Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for....
    • Removed fixed versions: 10.0.14393.9512, 10.0.17763.9245, 10.0.19044.7725, 10.0.19045.7725, 10.0.20348.5622.

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

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