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Microsoft Security Response CenterCVE-2026-83518

RPC Runtime Elevation of Privilege Vulnerability

HighVendor CVSS 7.8 / 10 1 CVE Published Oct 13, 2026 at 7:00 AM UTC

Summary

Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.

Products covered

  • Windows 11 Version 25H2 for ARM64-based Systems

  • Windows 11 Version 25H2 for x64-based Systems

  • Windows 11 Version 23H2 for ARM64-based Systems

  • Windows 11 Version 23H2 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

Remediation

Install KB5124008. Install KB5122880. Install KB5124012.

Vendor-listed fixes

  • 10.0.26200.9445

  • 10.0.22631.7582

  • 10.0.26100.9445

  • 10.0.28000.2954

CVEs in this advisory 1

Update history

What changed in later vendor updates

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    • The vendor changed the advisory's last-updated date.

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.