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Microsoft Windows: Use after free in Broadcast DVR User Service

CVE-2026-102197High 7.0

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Summary

A use-after-free vulnerability (CWE-416) in the Windows Broadcast DVR User Service allows an authorised local user to elevate privileges. The attacker must already have a local, low-privileged foothold on the system. The impact on confidentiality, integrity and availability is rated high if exploited.

Affected

  • Windows 10 Version 1809 and Windows Server 2019 (including Server Core): builds 10.0.17763.0 to below 10.0.17763.9376
  • Windows 10 Version 21H2: builds 10.0.19044.0 to below 10.0.19044.7807
  • Windows 10 Version 22H2: builds 10.0.19045.0 to below 10.0.19045.7807
  • Windows 11 Version 23H2: builds 10.0.22631.0 to below 10.0.22631.7652
  • Windows 11 Version 24H2: builds 10.0.26100.0 to below 10.0.26100.9711
  • Windows 11 Version 25H2: builds 10.0.26200.0 to below 10.0.26200.9711
  • Windows 11 Version 26H1: builds 10.0.28000.0 to below 10.0.28000.3231
  • Windows 11 Version 26H2: builds 10.0.26300.0 to below 10.0.26300.9711

Fixed in

  • Windows 10 Version 1809 and Windows Server 2019: build 10.0.17763.9376 or later (October 2026 update; KB5126651 according to secondary sources, to be confirmed in the MSRC Update Guide)
  • Other versions: the fixed builds listed in the affected section
  • Windows 10 Version 1809 is out of mainstream support; upgrading is advisable

Workaround

Unknown. No interim mitigation has been identified; applying the security update is the remedy.

Exploitation

  • No evidence of exploitation in the wild or public proof of concept found for this CVE.
  • CISA SSVC assessment: exploitation none, not automatable, total technical impact.
  • Some third-party bulletins for the October 2026 updates show exploit flags and a CISA due date; these are not confirmed for this CVE. Check the CISA KEV catalogue directly.

Our recommendation

  • Apply the October 2026 security update to Windows 10 Version 1809 and Windows Server 2019 hosts, and to all other affected versions.
  • Prioritise multi-user systems, terminal servers and workstations with a higher phishing risk.
  • Plan an upgrade for Windows 10 Version 1809, as it is out of mainstream support.
  • Monitor the CISA KEV catalogue for changes in exploitation status.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Windows Broadcast DVR User Service
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5126651, KB5126657, KB5126653, KB5127648, KB5127646

Entry in the Microsoft Security Update Guide

Public exploits

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 4 Nov 2026, 09:56.

Original description (NVD)

Use after free in Windows Broadcast DVR User Service allows an authorized attacker to elevate privileges locally.

NVD references (1)

Sources

The tracker combines official, freely usable data sources – updated continuously:

This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.

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