CVE-2026-21247 Windows Hyper-V Remote Code Execution Vulnerability

Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.


CVE-2026-21251 Cluster Client Failover (CCF) Elevation of Privilege Vulnerability

Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.


CVE-2026-21260 Microsoft Outlook Spoofing Vulnerability

Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.


CVE-2026-21248 Windows Hyper-V Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.


CVE-2026-21258 Microsoft Excel Information Disclosure Vulnerability

Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.


CVE-2026-21259 Microsoft Excel Elevation of Privilege Vulnerability

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.


CVE-2026-21512 Azure DevOps Server Cross-Site Scripting Vulnerability

Server-side request forgery (ssrf) in Azure DevOps Server allows an authorized attacker to perform spoofing over a network.


CVE-2026-21261 Microsoft Excel Information Disclosure Vulnerability

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.


CVE-2026-21256 GitHub Copilot and Visual Studio Remote Code Execution Vulnerability

Changes made to the security updates links and information. This is an informational change only.


CVE-2026-21511 Microsoft Outlook Spoofing Vulnerability

Acknowledgement added. This is an informational change only.


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