Microsoft Security Vulnerabilities Overview – 2026

In 2026, Microsoft identified and reported numerous important vulnerabilities across various products and services. These vulnerabilities can potentially lead to serious threats, including elevation of privilege, remote code execution, and denial of service. Below, we provide a summary of key vulnerabilities categorized by various Microsoft platforms and services.

Vulnerabilities in .NET Framework and Related Technologies

• CVE-2026-70161: .NET Elevation of Privilege Vulnerability – Severity: Important
• CVE-2026-70174: .NET Remote Code Execution Vulnerability – Severity: Important
• CVE-2026-70162: .NET Denial of Service Vulnerability – Severity: Important
• CVE-2026-96960: .NET Denial of Service Vulnerability – Severity: Important
• CVE-2026-96234: .NET Information Disclosure Vulnerability – Severity: Important
• CVE-2026-96238: .NET Security Feature Bypass Vulnerability – Severity: Important

Active Directory Vulnerabilities

• CVE-2026-83648: Windows Active Directory Domain Services Denial of Service Vulnerability – Severity: Important
• CVE-2026-70229: Windows Active Directory Domain Services Remote Code Execution Vulnerability – Severity: Critical
• CVE-2026-83667: Windows Active Directory Domain Services Denial of Service Vulnerability – Severity: Important

Key Vulnerabilities in Microsoft Office Products

• CVE-2026-88156: Microsoft Office Outlook Remote Code Execution Vulnerability – Severity: Critical
• CVE-2026-104726: Microsoft Office Excel Remote Code Execution Vulnerability – Severity: Important
• CVE-2026-102858: Microsoft Office OneNote Remote Code Execution Vulnerability – Severity: Important

Windows Vulnerabilities

• CVE-2026-70012: Remote Desktop Client Remote Code Execution Vulnerability – Severity: Important
• CVE-2026-70187: Windows Remote Desktop Services Remote Code Execution Vulnerability – Severity: Critical
• CVE-2026-83766: Windows Hyper-V Security Feature Bypass Vulnerability – Severity: Important

Additional Noteworthy Vulnerabilities

• CVE-2026-88115: Windows Server for NFS Remote Code Execution Vulnerability – Severity: Important
• CVE-2026-85796: Windows Installer Elevation of Privilege Vulnerability – Severity: Important
• CVE-2026-002270: Windows Smart Card Elevation of Privilege Vulnerability – Severity: Important

Conclusion

Microsoft continues to prioritize the identification and remediation of critical security vulnerabilities within its ecosystem. Users and businesses are encouraged to apply updates and monitor security advisories closely to mitigate risks associated with these vulnerabilities. Staying informed is essential for maintaining robust security in today’s digital landscape.