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CVE-2026-21509

Stories from across the site that focus on CVE-2026-21509.

Microsoft Issues Emergency Patch for Office Zero-Day Vulnerability CVE-2026-21509

Microsoft Issues Emergency Patch for Office Zero-Day Vulnerability CVE-2026-21509

Microsoft has released an urgent security update to address a critical zero-day vulnerability in Office, tracked as CVE-2026-21509, which is actively being exploited.

Jan 27, 2026