Microsoft Windows 11 Version 26H1 vulnerabilities

CVE-2026-87705 [HIGH] CWE-940 CVE-2026-87705: Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network.

CVE-2026-50364 [HIGH] CWE-59 CVE-2026-50364: Improper link resolution before file access ('link following') in Windows Server Backup allows an au Improper link resolution before file access ('link following') in Windows Server Backup allows an authorized attacker to elevate privileges locally.

CVE-2026-32149 [HIGH] CWE-20 CVE-2026-32149: Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally. Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.

CVE-2026-108399 [HIGH] CWE-122 CVE-2026-108399: Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges lo Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

CVE-2026-69337 [HIGH] CWE-415 CVE-2026-69337: Double free in Windows Registry allows an authorized attacker to elevate privileges over a network. Double free in Windows Registry allows an authorized attacker to elevate privileges over a network.

CVE-2026-69396 [HIGH] CWE-416 CVE-2026-69396: Use after free in Windows NDIS allows an authorized attacker to elevate privileges over a network. Use after free in Windows NDIS allows an authorized attacker to elevate privileges over a network.

CVE-2026-69296 [HIGH] CWE-416 CVE-2026-69296: Use after free in Windows Device Association Service allows an authorized attacker to elevate privil Use after free in Windows Device Association Service allows an authorized attacker to elevate privileges over a network.

CVE-2026-69274 [HIGH] CWE-416 CVE-2026-69274: Use after free in Windows Win32K allows an authorized attacker to elevate privileges over a network. Use after free in Windows Win32K allows an authorized attacker to elevate privileges over a network.

CVE-2026-69536 [HIGH] CWE-416 CVE-2026-69536: Use after free in Windows Remote Desktop Services allows an authorized attacker to execute code over Use after free in Windows Remote Desktop Services allows an authorized attacker to execute code over a network.

CVE-2026-69314 [HIGH] CWE-416 CVE-2026-69314: Use after free in Windows Device Association Broker service allows an authorized attacker to elevate Use after free in Windows Device Association Broker service allows an authorized attacker to elevate privileges over a network.

CVE-2026-69460 [HIGH] CWE-416 CVE-2026-69460: Use after free in Windows Modern Device Management (MDM) allows an authorized attacker to elevate pr Use after free in Windows Modern Device Management (MDM) allows an authorized attacker to elevate privileges over a network.

CVE-2026-69364 [HIGH] CWE-362 CVE-2026-69364: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Print Spooler Components allows an authorized attacker to elevate privileges over a network.

CVE-2026-83911 [HIGH] CWE-122 CVE-2026-83911: Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges lo Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

CVE-2026-102189 [HIGH] CWE-122 CVE-2026-102189: Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges lo Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

CVE-2026-100225 [HIGH] CWE-122 CVE-2026-100225: Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges lo Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

CVE-2026-100216 [HIGH] CWE-121 CVE-2026-100216: Stack-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges l Stack-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

CVE-2026-102191 [HIGH] CWE-122 CVE-2026-102191: Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges lo Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

CVE-2026-70573 [HIGH] CWE-20 CVE-2026-70573: Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate pri Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate privileges locally.

CVE-2026-83827 [HIGH] CWE-122 CVE-2026-83827: Heap-based buffer overflow in Windows Bluetooth Port Driver allows an authorized attacker to elevate Heap-based buffer overflow in Windows Bluetooth Port Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-70578 [HIGH] CWE-122 CVE-2026-70578: Heap-based buffer overflow in Windows Credential Guard allows an authorized attacker to elevate priv Heap-based buffer overflow in Windows Credential Guard allows an authorized attacker to elevate privileges locally.