Microsoft Windows 11 Version 26H1 vulnerabilities

CVE-2026-50348 [HIGH] CWE-362 CVE-2026-50348: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an unauthorized attacker to elevate privileges over a network.

CVE-2026-69777 [HIGH] CWE-122 CVE-2026-69777: Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privilege Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.

CVE-2026-83699 [HIGH] CWE-121 CVE-2026-83699: Stack-based buffer overflow in Windows Client-Side Caching (CSC) Service allows an authorized attack Stack-based buffer overflow in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.

CVE-2026-69455 [HIGH] CWE-122 CVE-2026-69455: Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.

CVE-2026-62783 [HIGH] CWE-122 CVE-2026-62783: Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.

CVE-2026-62758 [HIGH] CWE-122 CVE-2026-62758: Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.

CVE-2026-62755 [HIGH] CWE-121 CVE-2026-62755: Stack-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileg Stack-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges locally.

CVE-2026-70014 [HIGH] CWE-416 CVE-2026-70014: Use after free in Windows Cryptographic Services allows an authorized attacker to execute code over Use after free in Windows Cryptographic Services allows an authorized attacker to execute code over a network.

CVE-2026-62813 [HIGH] CWE-416 CVE-2026-62813: Use after free in Active Directory Domain Services allows an authorized attacker to execute code ove Use after free in Active Directory Domain Services allows an authorized attacker to execute code over a network.

CVE-2026-69757 [HIGH] CWE-416 CVE-2026-69757: Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges over a network. Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges over a network.

CVE-2026-69761 [HIGH] CWE-416 CVE-2026-69761: Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges over a network. Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges over a network.

CVE-2026-50398 [HIGH] CWE-362 CVE-2026-50398: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Media allows an authorized attacker to elevate privileges over a network.

CVE-2026-58531 [HIGH] CWE-362 CVE-2026-58531: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB allows an authorized attacker to elevate privileges over a network.

CVE-2026-50379 [HIGH] CWE-362 CVE-2026-50379: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Media allows an authorized attacker to elevate privileges over a network.

CVE-2026-32162 [HIGH] CWE-349 CVE-2026-32162: Acceptance of extraneous untrusted data with trusted data in Windows COM allows an unauthorized atta Acceptance of extraneous untrusted data with trusted data in Windows COM allows an unauthorized attacker to elevate privileges locally.

CVE-2026-21238 [HIGH] CWE-284 CVE-2026-21238: Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attack Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-80083 [HIGH] CWE-822 CVE-2026-80083: Untrusted pointer dereference in Windows Hyper-V allows an authorized attacker to execute code local Untrusted pointer dereference in Windows Hyper-V allows an authorized attacker to execute code locally.

CVE-2026-69740 [HIGH] CWE-416 CVE-2026-69740: Use after free in Windows Hello allows an authorized attacker to elevate privileges locally. Use after free in Windows Hello allows an authorized attacker to elevate privileges locally.

CVE-2026-69784 [HIGH] CWE-416 CVE-2026-69784: Use after free in Windows Hello allows an authorized attacker to elevate privileges locally. Use after free in Windows Hello allows an authorized attacker to elevate privileges locally.

CVE-2026-27914 [HIGH] CWE-284 CVE-2026-27914: Improper access control in Microsoft Management Console allows an authorized attacker to elevate pri Improper access control in Microsoft Management Console allows an authorized attacker to elevate privileges locally.