Microsoft has just released an important Windows 10 security update — KB5075912 — as part of its February 2026 Patch Tuesday cycle, and cybersecurity experts are urging users to install it right away. This extended security update addresses multiple zero-day vulnerabilities that have been actively exploited, along with dozens of other security issues and important system fixes.
📌 What Is KB5075912 and Who Should Install It?
The KB5075912 update is an Extended Security Update (ESU) for Windows 10 devices, especially for those still running supported versions such as Windows 10 version 22H2 and Windows 10 Enterprise LTSC. It’s designed to provide ongoing security maintenance even though mainstream Windows 10 feature updates have ended.
This update is available through Windows Update — just open Settings > Update & Security > Windows Update and click “Check for updates.” Systems enrolled in the ESU program will see this patch automatically.
🛡️ Why This Update Matters
✅ Fixes 58 Vulnerabilities
KB5075912 bundles fixes for 58 different security flaws, ranging from low-impact bugs to serious threats that could allow hackers to breach systems.
⚠️ Patches Six Actively Exploited Zero-Day Vulnerabilities
Most importantly, this update patches six zero-day vulnerabilities — flaws that attackers were already exploiting in real-world scenarios before the patch was available. These types of vulnerabilities are especially dangerous because they can be abused immediately by attackers.
These zero-days include issues that could allow attackers to bypass Windows security protections, elevate privileges, or disrupt services if unpatched systems are targeted.
🔐 Strengthens Secure Boot Protection
Another key part of the update helps prepare for expiring Secure Boot certificates. Secure Boot is a security feature that ensures your PC boots using trusted software. Microsoft warned that older certificates from 2011 will expire in June 2026, which could weaken this protection if not replaced. This update rolls out new certificates gradually to keep systems secure.
🛠️ Other Fixes and Improvements
In addition to security patches, the update fixes bugs affecting:
Shutdown and hibernation behavior on devices with certain security settings enabled.
File Explorer folder renaming issues.
Graphics stability problems on specific hardware configurations.
📈 What Happens After You Install KB5075912
Once installed, Windows 10 systems will update to Build 19045.6937, and Windows 10 Enterprise LTSC 2021 machines will move to Build 19044.6937.
Microsoft reports no known issues with this update so far, and devices should continue operating normally after installation.
⚡ Expert Tip: Stay Updated
Security professionals recommend applying this update as soon as possible — especially on devices connected to the internet or used by organizations — to reduce the risk from actively exploited vulnerabilities.
