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Microsoft has acknowledged a known issue where the August 2026 security update makes CompatTelRunner.exe fail repeatedly on Windows Server 2016, filling event logs with Event ID 1000 and exception code 0xc0000409. The company says device functionality is not affected.
Researchers H0j3n and Aniq Fakhrul have released a working exploit for Certighost, an Active Directory Certificate Services flaw patched in July 2026 that let any low-privileged domain user impersonate a domain controller and reach full domain compromise.
Microsoft's January 2026 Patch Tuesday cumulative updates for Windows Server — KB5073379, KB5073457, and KB5073723 — deliver security fixes and quality improvements across supported Windows Server releases. Administrators should review the applicable build for their environment before deploying.
