Microsoft March Patch Tuesday Ships 83 Fixes and Windows 11 Cumulative Updates
Microsoft’s March Patch Tuesday security release shipped fixes for 83 vulnerabilities across its enterprise software and services, and was notable for having no actively exploited zero-days for the first time in six months. Microsoft flagged six vulnerabilities as “more likely to be exploited,” and noted two issues—CVE-2026-21262 and CVE-2026-26127—were publicly known at release. Researchers highlighted an Excel information-disclosure issue, CVE-2026-26144, describing a scenario where an attacker could potentially induce a Copilot Agent to exfiltrate data in a zero-click style workflow, and also pointed to Office flaws CVE-2026-26110 and CVE-2026-26113 (CVSS 8.4) that could enable arbitrary code execution via the Office preview pane.
Microsoft also released mandatory Windows 11 cumulative updates KB5079473 (25H2/24H2) and KB5078883 (23H2) that incorporate the March 2026 Patch Tuesday security fixes, along with additional non-security changes. The updates advance build numbers to 26200.8037/26100.8037 (25H2/24H2) and 22631.6783 (23H2), expand “high-confidence device targeting” to increase coverage for automatic delivery of new Secure Boot certificates, and include reliability improvements such as better File Explorer search across drives and changes to Windows Defender Application Control (WDAC) behavior for COM objects (policy listing support).
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