Microsoft patches actively exploited Office zero-day vulnerability

Executive Summary In a swift response to escalating cyber threats, Microsoft has issued an emergency security update to remediate a high-severity zero-day vulnerability affecting several versions of Microsoft Office. Tracked as CVE-2026-21509, this security feature bypass flaw impacts Microsoft Office 2016, 2019, LTSC 2021, LTSC 2024, and Microsoft 365 Apps for Enterprise. The vulnerability is actively […]

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