Microsoft has released its February 2026 update for Windows machines, which fixes multiple zero-days and other security issues. In addition to fixing issues, the new update continues upgrading the expiring Secure Boot certificates to protect your device from bootkit malware. The updates are available for Windows 11 and Windows 10 devices. They come with security updates for 58 flaws, including 6 actively exploited and 3 publicly disclosed zero-day vulnerabilities.
Microsoft Windows February 2026 update fixes six actively exploited zero-days
Microsoft’s Windows February 2026 update rollout highlights the typically high number of actively exploited flaws. Microsoft has fixed CVE-2026-21510, which is a critical Windows Shell security feature bypass. It allows threat actors to bypass SmartScreen prompts and “Mark of the Web” protections simply by convincing a user to open a malicious link file.
Similarly, CVE-2026-21513 affects the MSHTML engine, allowing attackers to bypass security features over a network. As for CVE-2026-21514, it addresses an issue in Microsoft Word where malicious Office files could bypass Object Linking and Embedding (OLE) mitigations. The update also fixes CVE-2026-21519, CVE-2026-21533, and CVE-2026-21525.
The update brings more fixes
Beyond the zero-day fixes, the latest update fixes dozens of high-severity and moderately sensitive vulnerabilities. Some of these include memory corruption issues, authentication bypass flaws, and information disclosure bugs. Microsoft has also added non-security improvements that aim to improve system reliability and performance.
Some Windows 10 and 11 users may notice minor stability enhancements, mainly in networking and device driver compatibility. Microsoft is using this update to deliver new signals regarding the readiness of devices for the upcoming Secure Boot certificate expiration in June 2026. This step makes sure that Windows machines will seamlessly transition to the new 2026 certificates without boot failures.
Microsoft has advised Windows 10 and Windows 11 users to install these updates. Navigate to Settings > Windows Update and click “Check for updates” to get the latest updates. You can find a detailed changelog of the new update on the company’s support website.
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