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Microsoft Windows Search: Use-after-free leads to local privilege escalation

CVE-2026-83564High 7.0

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Summary

A use-after-free vulnerability (CWE-416) in the Windows Search component allows an authorized local attacker to elevate privileges. The attacker needs a low-privilege account and local access, and the attack complexity is rated high. Exploitation is not known, and the vulnerability is not remotely exploitable.

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 Version 21H2 (10.0.19044.0 to before 10.0.19044.7807)
  • Windows 10 Version 22H2 (10.0.19045.0 to before 10.0.19045.7807)
  • Windows 11 Version 23H2 (10.0.22631.0 to before 10.0.22631.7652)
  • Windows 11 Version 24H2, 25H2, 26H1 and 26H2 (fixed builds: unconfirmed, verify on MSRC)
  • Windows Server 2012 and 2012 Server Core (6.2.9200.0 to before 6.2.9200.26434)
  • Windows Server 2012 R2 and 2012 R2 Server Core (6.3.9600.0 to before 6.3.9600.23470)
  • Windows Server 2016 (10.0.14393.0 to before 10.0.14393.9612)

Fixed in

  • Windows 10 1607 / Server 2016: 10.0.14393.9612
  • Windows 10 1809: 10.0.17763.9376
  • Windows 10 21H2: 10.0.19044.7807
  • Windows 10 22H2: 10.0.19045.7807
  • Windows 11 23H2: 10.0.22631.7652 (per secondary source, unconfirmed)
  • Server 2012 / Server 2012 Server Core: 6.2.9200.26434
  • Server 2012 R2 / Server 2012 R2 Server Core: 6.3.9600.23470
  • Build numbers should be verified against the MSRC advisory before deployment.

Workaround

Unknown. No vendor-documented workaround was found. The sources only point to installing the Microsoft security update.

Exploitation

  • Not listed in the CISA KEV catalog.
  • CISA SSVC: exploitation none, automatable no, technical impact total.
  • EPSS is about 0.3%.
  • No public proof of concept found; this is not confirmed absent.

Our recommendation

  • Install the Microsoft security update for the affected Windows and Server builds in the next regular patch cycle, starting with multi-user servers, terminal servers and workstations with untrusted users.
  • Verify the build numbers on the MSRC advisory before rollout.
  • Check whether any devices still run Windows 10 1607 and whether they are on a supported servicing path; plan their replacement or upgrade.
  • Monitor for privilege escalation indicators on shared systems.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Microsoft Windows Search Component
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5127648, KB5126651, KB5126655, KB5126657, KB5126646, 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, 08:44.

Original description (NVD)

Use after free in Microsoft Windows Search Component 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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