Windows OLE: Heap-based buffer overflow allows local privilege escalation

Summary

A heap-based buffer overflow in Windows OLE allows an authorized local attacker to elevate privileges. Successful exploitation would give the attacker high confidentiality, integrity and availability impact on the host, which the CNA rates as total technical impact. The attacker needs a local, low-privileged user session, so the vulnerability is not directly reachable from the internet.

Affected

• Windows 10 Version 1607 (Build 10.0.14393.0 to before 10.0.14393.9688)
• Windows 10 Version 1809 (Build 10.0.17763.0 to before 10.0.17763.9487)
• Windows 10 Version 21H2 (Build 10.0.19044.0 to before 10.0.19044.7846)
• Windows 10 Version 22H2 (Build 10.0.19045.0 to before 10.0.19045.7846)
• Windows 11 Version 23H2 (Build 10.0.22631.0 to before 10.0.22631.7711)
• Windows 11 Version 24H2 (Build 10.0.26100.0 to before 10.0.26100.9974)
• Windows 11 Version 25H2 (Build 10.0.26200.0 to before 10.0.26200.9974)
• Windows 11 Version 26H1 (Build 10.0.28000.0 to before 10.0.28000.3501)
• Windows 11 Version 26H2 (Build 10.0.26300.0 to before 10.0.26300.9974)
• Windows Server 2016, including Server Core installation (Build 10.0.14393.0 to before 10.0.14393.9688)
• Windows Server 2019, including Server Core installation (Build 10.0.17763.0 to before 10.0.17763.9487)
• Windows Server 2022 (Build 10.0.20348.0 to before 10.0.20348.5870)

Fixed in

• Install the Windows update for the November 2026 release or later that brings the builds to at least 10.0.14393.9688, 10.0.17763.9487, 10.0.19044.7846, 10.0.19045.7846, 10.0.22631.7711, 10.0.26100.9974, 10.0.26200.9974, 10.0.28000.3501, 10.0.26300.9974 or 10.0.20348.5870, depending on the product
• Fixed build numbers are taken from the CVE record; confirm the KB numbers in the Microsoft Security Update Guide

Workaround

Unknown.

Exploitation

• No evidence of active exploitation of this CVE found.
• CISA SSVC assessment: exploitation none, automatable no, technical impact total.
• The CVE record's temporal vector (E:U) indicates no known exploit code at publication.
• No public proof of concept found.
• The actively exploited item in the November 2026 release is a different CVE (CVE-2026-124194, Outlook).

Our recommendation

• Install the security update on all affected Windows 10, 11 and Server systems as a priority, starting with shared workstations, RDS/terminal servers and endpoints where phishing may have succeeded.
• Check whether any systems run Windows 11 Version 23H2 Enterprise or Education, which reportedly reached end of updates; plan an upgrade rather than relying on patches alone.
• Monitor for unusual privilege escalation or new SYSTEM-level processes on endpoints until patching is complete.

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-2026-95933 msrc.microsoft.com
• CVE Record CVE-2026-95933 (CVE Program) www.cve.org
• Microsoft November 2026 Patch Tuesday overview (NTCompatible) www.ntcompatible.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, 03:02.