Windows Key Distribution Center: Elevation of privilege

Summary

An improper verification of a cryptographic signature in the Windows Key Distribution Center (KDC), a Kerberos component, allows an authorized local attacker to elevate privileges. The attacker needs a local low-privilege account or an existing foothold on the system, and the flaw is not remotely exploitable. Microsoft states that a successful attacker could gain SYSTEM privileges, which on a domain controller would mean full domain compromise.

Affected

• Windows 10 Version 1607: 10.0.14393.0 to < 10.0.14393.9612
• Windows 10 Version 1809: 10.0.17763.0 to < 10.0.17763.9376
• Windows 11 Version 24H2: 10.0.26100.0 to < 10.0.26100.9711
• Windows 11 Version 25H2: 10.0.26200.0 to < 10.0.26200.9711
• Windows 11 Version 26H1: 10.0.28000.0 to < 10.0.28000.3231
• Windows 11 Version 26H2: 10.0.26300.0 to < 10.0.26300.9711
• Windows Server 2012 (including Server Core): 6.2.9200.0 to < 6.2.9200.26434
• Windows Server 2012 R2 (including Server Core): 6.3.9600.0 to < 6.3.9600.23470
• Windows Server 2016 (including Server Core): 10.0.14393.0 to < 10.0.14393.9612
• Windows Server 2019 (including Server Core): 10.0.17763.0 to < 10.0.17763.9376
• Windows Server 2022: 10.0.20348.0 to < 10.0.20348.5761

Fixed in

• Install the Microsoft security update for the affected build.
• Fixed builds: 10.0.14393.9612 (Windows 10 1607, Server 2016), 10.0.17763.9376 (1809, Server 2019), 10.0.20348.5761 (Server 2022), 10.0.26100.9711 (24H2), 10.0.26200.9711 (25H2), 10.0.26300.9711 (26H2), 10.0.28000.3231 (26H1).
• Server 2012: 6.2.9200.26434. Server 2012 R2: 6.3.9600.23470.
• Security update identifiers (KB numbers): Unknown.

Workaround

• Unknown. No workaround is documented in the CVE record or the sources.
• Reduce the risk by limiting local logon rights and administrative privileges.

Exploitation

• Microsoft reports: not publicly disclosed, not exploited, exploitability assessment 'Exploitation Unlikely'.
• CISA SSVC: exploitation none, not automatable, total technical impact.
• EPSS: 0.00227.
• No known in-the-wild use.

Our recommendation

• Patch domain controllers and Windows Server systems first, then workstations and Windows 10 1607 devices.
• Check whether Windows 10 1607 is still in standard servicing; if not, plan an upgrade or Extended Security Updates.
• Restrict local logon and administrative rights to reduce the chance of a low-privilege foothold.
• Keep CVE-2026-69640 (a separate, network-reachable KDC flaw) separate in your prioritisation.

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-2026-69650 msrc.microsoft.com
• Microsoft Security Update Guide (en-US): CVE-2026-69650 msrc.microsoft.com
• Vulners CVElist record: CVE-2026-69650 vulners.com
• Vulners MSCVE record: CVE-2026-69650 vulners.com
• Strix.ai: CVE-2026-69650 www.strix.ai
• OpenCVE: CVE-2026-69650 app.opencve.io
• Positive Technologies advisory PT-2026-112067 vulners.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 2 Nov 2026, 04:52.