Microsoft Patch Tuesday for March 2026 — Snort rules and prominent vulnerabilities

Microsoft's March 2026 security update fixes 79 vulnerabilities — including three critical Office/Excel RCE and information-disclosure issues and numerous important remote code execution and privilege-escalation flaws across SharePoint, SQL Server, Azure MCP, SMB, and Windows components — with Cisco Talos providing Snort/SRU rules to detect exploitation attempts; Microsoft rates exploitation of the three critical issues as unlikely and some important vulnerabilities as more likely to be exploited.