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Windows 10 1607: Use after free in Windows Error Reporting

CVE-2026-83689High 7.0

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Summary

A use-after-free flaw (CWE-416) in the Windows Error Reporting component allows an authorized local attacker to elevate privileges. The attacker needs a local account with low privileges, and the attack complexity is high. Microsoft rates the issue Important and has released fixes for the affected Windows builds on October 13, 2026.

Affected

  • Windows 10 Version 1607 (10.0.14393.0 to before 10.0.14393.9612)
  • Windows 10 Version 1809 (10.0.17763.0 to before 10.0.17763.9376)
  • Windows 10 Versions 21H2 and 22H2
  • Windows 11 Versions 23H2, 24H2, 25H2, 26H1 and 26H2
  • Windows Server 2012, 2012 R2 and 2016, including Server Core installations

Fixed in

  • Windows 10 Version 1607: 10.0.14393.9612 or later (verify on the MSRC page)
  • Windows 10 Version 1809: 10.0.17763.9376 or later
  • Windows 10 Version 21H2: 10.0.19044.7807 or later
  • Windows 10 Version 22H2: 10.0.19045.7807 or later
  • Windows 11 Version 23H2: 10.0.22631.7652 or later
  • Windows 11 Version 24H2: 10.0.26100.9711 or later
  • Windows 11 Versions 25H2 and 26H2: 10.0.26200.9711 and 10.0.26300.9711 or later
  • Windows 11 Version 26H1: 10.0.28000.3231 or later
  • Windows Server 2012 and 2012 R2: 6.2.9200.26434 and 6.3.9600.23470 or later
  • Windows Server 2016: 10.0.14393.9612 or later

Workaround

  • No official mitigation found. Install the security update released on October 13, 2026.
  • Unverified option from a third-party aggregator: disable the Windows Error Reporting service until the patch is installed. This stops crash reporting and may affect troubleshooting.

Exploitation

  • No evidence of exploitation in the wild found. The full CISA KEV catalog was not checked.
  • No public proof of concept found.
  • EPSS about 0.28 percent (low).
  • CISA SSVC: exploitation none, not automatable, total technical impact.

Our recommendation

  • Patch affected systems in the next update cycle, starting with Windows 10 1607 systems and shared or multi-user machines.
  • Confirm that Windows 10 1607 devices still receive security updates; replace systems without a supported update path.
  • Restrict local accounts on shared workstations and terminal servers.
  • Re-check the CISA KEV catalog and public exploit sources after publication.
  • Patch CVE-2026-83669, which affects the same component, in the same cycle.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Windows Error Reporting
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, KB5126655, KB5126657, KB5126646, KB5127648, KB5126653

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, 08:35.

Original description (NVD)

Use after free in Windows Error Reporting 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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