Microsoft released its February 2026 Patch Tuesday update addressing 58 security flaws, while the stock closed slightly higher at $414.71 (+0.27%). The release features a "generational refresh" of the Windows core security foundation through updated Secure Boot certificates.
- The update addresses 6 actively exploited zero-day vulnerabilities and 5 critical flaws, covering various remote code execution and elevation of privilege issues.
- Microsoft is replacing expiring 2011 Secure Boot certificates to modernize system security across the Windows ecosystem.
- MSFT shares showed resilience by gaining 0.27%, outperforming both the S&P 500 (-0.07%) and the Nasdaq (-0.26%).