Patch Tuesday - March 2026

Key Points:

• Microsoft has released patches for 77 vulnerabilities in March 2026, including critical issues such as CVE-2026-21262, an elevation of privilege vulnerability in SQL Server that allows an authorized attacker to gain sysadmin privileges over a network.
• The impact of CVE-2026-21262 is significant, with a CVSS score of 8.8, potentially allowing attackers to exfiltrate data or manipulate the database. Other notable vulnerabilities include CVE-2026-26127 for .NET applications, which could lead to denial of service.
• It is recommended that organizations promptly apply the patches for these vulnerabilities, especially for SQL Server instances exposed to the internet, and review mobile device management policies to mitigate risks associated with malicious authenticator apps.

Technical Details: CVE-2026-21262 allows elevation of privilege in SQL Server versions from 2016 SP3 onwards. CVE-2026-26127 affects .NET applications and can trigger service crashes.

MITRE ATT&CK Techniques:

• T1068 - Exploitation of Elevation of Privilege (Privilege Escalation)
• T1499 - Endpoint Denial of Service (Impact)

IOCs Mentioned: None mentioned.