Microsoft Windows: Missing authorization allows local tampering

Summary

Improper access control (CWE-862) in the Microsoft Account component of Windows allows an authorized local attacker to tamper with data. According to the CVSS vector, only integrity is affected, with no confidentiality or availability impact. The attacker needs a local account with low privileges and no user interaction, so this is not an internet-facing risk.

Affected

• Windows 10 Version 1607 (10.0.14393.0 before 10.0.14393.9688)
• Windows 10 Version 1809 (10.0.17763.0 before 10.0.17763.9487)
• Windows 10 Version 21H2 (10.0.19044.0 before 10.0.19044.7846)
• Windows 10 Version 22H2 (10.0.19045.0 before 10.0.19045.7846)
• Windows 11 Version 23H2 (10.0.22631.0 before 10.0.22631.7711)
• Windows 11 Version 24H2 (10.0.26100.0 before 10.0.26100.9974)
• Windows 11 Version 25H2 (10.0.26200.0 before 10.0.26200.9974)
• Windows 11 Version 26H1 (10.0.28000.0 before 10.0.28000.3501)
• Windows 11 Version 26H2 (10.0.26300.0 before 10.0.26300.9974)
• Windows Server 2016, including Server Core (10.0.14393.0 before 10.0.14393.9688)
• Windows Server 2019, including Server Core (10.0.17763.0 before 10.0.17763.9487)
• Windows Server 2022 (10.0.20348.0 before 10.0.20348.5870)
• Not fully verified: the CVE record and a third-party tracker differ on some products (for example Server 2025); confirm in the MSRC advisory.

Fixed in

• Installation of the November 2026 Windows security updates.
• Fixed builds: 10.0.14393.9688 or later (Windows 10 1607, Server 2016), 10.0.17763.9487 or later (Windows 10 1809, Server 2019), 10.0.19044.7846 or later (21H2), 10.0.19045.7846 or later (22H2), 10.0.22631.7711 or later (Windows 11 23H2), 10.0.26100.9974 or later (24H2), 10.0.26200.9974 or later (25H2), 10.0.26300.9974 or later (26H2), 10.0.28000.3501 or later (26H1), 10.0.20348.5870 or later (Server 2022).
• The complete list must be confirmed in the MSRC advisory.

Workaround

Unknown. No vendor workaround was found. Patching is the remediation.

Exploitation

• No evidence of exploitation in the wild was found.
• The CVE record lists exploit maturity as Unproven (E:U).
• Rapid7 rates exploitation as less likely.
• CISA SSVC: exploitation none, automatable no, technical impact partial.
• No public proof of concept or CISA KEV listing was found at the time of research.

Our recommendation

• Install the November 2026 Windows security updates on all affected systems, with priority on Windows 10 machines still on Extended Security Updates, multi-user terminal servers and shared workstations.
• Verify the installed build numbers against the fixed builds after patching.
• Limit local logon to trusted users and review local accounts on shared systems.
• Monitor CISA KEV and public proof-of-concept sources and re-check the status of this CVE in the coming weeks.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

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

Research sources

• Microsoft Security Update Guide: CVE-2026-112974 msrc.microsoft.com
• CVE Record CVE-2026-112974 www.cve.org
• Rapid7: Patch Tuesday November 2026 www.rapid7.com
• Strix: CVE-2026-112974 (third-party version data) www.strix.ai
• BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com

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, 16:51.