Microsoft Windows 11 Version 26H1 vulnerabilities

CVE-2026-69976 [HIGH] CWE-416 CVE-2026-69976: Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a netwo Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CVE-2026-69997 [HIGH] CWE-416 CVE-2026-69997: Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a netwo Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CVE-2026-97789 [HIGH] CWE-416 CVE-2026-97789: Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a netwo Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CVE-2026-69553 [HIGH] CWE-862 CVE-2026-69553: Missing authorization in Windows Hyper-V allows an authorized attacker to elevate privileges over a Missing authorization in Windows Hyper-V allows an authorized attacker to elevate privileges over a network.

CVE-2026-21255 [HIGH] CWE-284 CVE-2026-21255: Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security featur Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.

CVE-2026-83728 [HIGH] CWE-1286 CVE-2026-83728: Improper validation of syntactic correctness of input in Windows Hyper-V allows an authorized attack Improper validation of syntactic correctness of input in Windows Hyper-V allows an authorized attacker to perform spoofing locally.

CVE-2026-42986 [HIGH] CWE-416 CVE-2026-42986: Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges l Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.

CVE-2026-70563 [HIGH] CWE-59 CVE-2026-70563: Improper link resolution before file access ('link following') in Windows Shell allows an unauthoriz Improper link resolution before file access ('link following') in Windows Shell allows an unauthorized attacker to perform spoofing over a network.

CVE-2026-69807 [HIGH] CWE-22 CVE-2026-69807: Improper limitation of a pathname to a restricted directory ('path traversal') in Windows PowerShell Improper limitation of a pathname to a restricted directory ('path traversal') in Windows PowerShell allows an authorized attacker to elevate privileges over a network.

CVE-2026-40400 [HIGH] CWE-23 CVE-2026-40400: Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a n Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network.

CVE-2026-68827 [HIGH] CWE-122 CVE-2026-68827: Integer underflow (wrap or wraparound) in Windows GDI+ allows an authorized attacker to elevate priv Integer underflow (wrap or wraparound) in Windows GDI+ allows an authorized attacker to elevate privileges over a network.

CVE-2026-88121 [HIGH] CWE-416 CVE-2026-88121: Use after free in Windows Background Intelligent Transfer Service (BITS) allows an unauthorized atta Use after free in Windows Background Intelligent Transfer Service (BITS) allows an unauthorized attacker to execute code over a network.

CVE-2026-85359 [HIGH] CWE-94 CVE-2026-85359: Improper control of generation of code ('code injection') in Windows Performance Monitor allows an a Improper control of generation of code ('code injection') in Windows Performance Monitor allows an authorized attacker to elevate privileges locally.

CVE-2026-70031 [HIGH] CWE-122 CVE-2026-70031: Heap-based buffer overflow in Windows iSCSI allows an unauthorized attacker to deny service over a n Heap-based buffer overflow in Windows iSCSI allows an unauthorized attacker to deny service over a network.

CVE-2026-83860 [HIGH] CWE-121 CVE-2026-83860: Stack-based buffer overflow in Windows GDI allows an unauthorized attacker to deny service over a ne Stack-based buffer overflow in Windows GDI allows an unauthorized attacker to deny service over a network.

CVE-2026-70233 [HIGH] CWE-122 CVE-2026-70233: Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-21236 [HIGH] CWE-122 CVE-2026-21236: Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized att Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-83830 [HIGH] CWE-122 CVE-2026-83830: Heap-based buffer overflow in Windows COM+ Event System Service allows an authorized attacker to ele Heap-based buffer overflow in Windows COM+ Event System Service allows an authorized attacker to elevate privileges locally.

CVE-2026-70132 [HIGH] CWE-122 CVE-2026-70132: Heap-based buffer overflow in Windows Portable Device File System Driver allows an authorized attack Heap-based buffer overflow in Windows Portable Device File System Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-83514 [HIGH] CWE-122 CVE-2026-83514: Heap-based buffer overflow in Windows Partition Management Driver allows an authorized attacker to e Heap-based buffer overflow in Windows Partition Management Driver allows an authorized attacker to elevate privileges locally.