CVE-2026-124194 and the Microsoft 365 Outage: A Practical Security Analysis for Outlook Administrators
A practical security analysis of the Microsoft 365 outage, Outlook’s CVE-2026-124194, and the controls that protect end users. The November 12–13, 2026 Microsoft 365 disruption was primarily an Exchange Online infrastructure failure, not a client-side Outlook bug. Separately, Microsoft disclosed an actively exploited Outlook spoofing vulnerability, CVE-2026-124194, which requires urgent patching of supported Outlook installations….