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Windows IP Translation Configuration Service: Privilege escalation via use-after-free

CVE-2026-119871Medium 6.4

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Summary

A use-after-free flaw (CWE-416) in the Windows IP Translation Configuration Service allows a local, authorised attacker to elevate privileges. The service runs as Local System, so a successful attack gives full control of the host. The attack requires local access, existing privileges and high attack complexity, and it is not reachable from the internet.

Affected

  • Windows 10 Version 1607 (before 10.0.14393.9688)
  • Windows 10 Version 1809 (before 10.0.17763.9487)
  • Windows 10 Version 21H2 (before 10.0.19044.7846)
  • Windows 10 Version 22H2 (before 10.0.19045.7846)
  • Windows 11 Version 23H2 (before 10.0.22631.7711)
  • Windows 11 Version 24H2 (before 10.0.26100.9974 per CNA record; build number to be verified on MSRC)
  • Windows 11 Version 25H2 (before 10.0.26200.9974)
  • Windows 11 Version 26H1 (before 10.0.28000.3501)
  • Windows 11 Version 26H2 (before 10.0.26300.9974)
  • Windows Server 2016, including Server Core (before 10.0.14393.9688)
  • Windows Server 2019, including Server Core (before 10.0.17763.9487)
  • Windows Server 2022 (before 10.0.20348.5870)

Fixed in

Fixed in the Microsoft security updates of 10 November 2026. Secondary sources list KB5132061 (24H2), KB5132059 (26H1), KB5131087 (23H2) and KB5131085 (Server 2019 / 1809). No KB found for Windows 10 1607 or Server 2016. Verify all KB numbers and builds on MSRC and in the Microsoft Update Catalog before rollout.

Workaround

Unknown. Microsoft has not published a workaround.

  • Not vendor-confirmed: on hosts that do not need IP translation, keep the service stopped or disabled. Test first, as dependent features may break.

Exploitation

  • No confirmed exploitation in the wild.
  • No public proof of concept found.
  • Microsoft rates exploit maturity as unproven (E:U).
  • CISA SSVC: exploitation none, not automatable, total technical impact.
  • Not listed in CISA KEV according to secondary sources.

Our recommendation

  • Include this update in the November 2026 patch cycle and prioritise servers, terminal servers and legacy 1607/1809 systems.
  • Check the exact build numbers on MSRC before rollout, as the sources disagree on the 24H2 build.
  • Plan the reboot windows, as the November batch is large.
  • Limit local logon rights and review accounts with local access on multi-user servers.
  • If IP translation is not required, consider disabling the service after testing.

Information from Microsoft (Patch Tuesday November 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Windows IP Translation Configuration 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)
KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061

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 11 Nov 2026, 13:51.

Original description (NVD)

Use after free in Windows IP Translation Configuration 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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