Microsoft has issued an urgent security update addressing CVE-2026-1862, a critical vulnerability affecting multiple Windows versions. Users must apply patches immediately to prevent potential exploitation.
Microsoft has released a critical security update addressing CVE-2026-1862, a vulnerability that could allow attackers to execute arbitrary code on affected systems. The flaw impacts multiple Windows operating systems, including Windows 10, Windows 11, and various Windows Server versions.
The vulnerability has been assigned a CVSS score of 9.8 out of 10, indicating its severe nature. Microsoft's Security Update Guide details that the issue stems from improper validation of user input in the Windows kernel, potentially enabling privilege escalation and system compromise.
Affected Products and Versions:
- Windows 10 Version 21H2 and later
- Windows 11 all versions
- Windows Server 2019 and 2022
- Windows Server 2022 Essentials
Mitigation Steps:
- Enable automatic updates on all Windows devices
- Manually check for updates via Settings > Update & Security
- Apply the latest cumulative security update immediately
- For enterprise environments, deploy through WSUS or SCCM
Microsoft has confirmed that the vulnerability is being actively exploited in limited targeted attacks. The company urges all users to update their systems without delay. Organizations with critical infrastructure should prioritize patching production servers.
Timeline:
- Vulnerability discovered: March 15, 2026
- Patch released: March 18, 2026
- First exploitation reports: March 17, 2026
The security update can be downloaded from the Microsoft Update Catalog or through Windows Update. Microsoft has also released detailed technical documentation for IT administrators managing large-scale deployments.
Users experiencing issues with the update can contact Microsoft Support or consult the Microsoft Security Response Center for additional guidance.
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