Microsoft Windows 11 25H2 vulnerabilities

CVE-2026-40415 [HIGH] CWE-416 CVE-2026-40415: Use after free in Windows TCP/IP allows an unauthorized attacker to execute code over a network. Use after free in Windows TCP/IP allows an unauthorized attacker to execute code over a network.

CVE-2026-45635 [HIGH] CWE-843 CVE-2026-45635: Access of resource using incompatible type ('type confusion') in Universal Plug and Play (upnp.dll) Access of resource using incompatible type ('type confusion') in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.

CVE-2026-45599 [HIGH] CWE-416 CVE-2026-45599: Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.

CVE-2026-33829 [MEDIUM] CWE-200 CVE-2026-33829: Exposure of sensitive information to an unauthorized actor in Windows Snipping Tool allows an unauth Exposure of sensitive information to an unauthorized actor in Windows Snipping Tool allows an unauthorized attacker to perform spoofing over a network.

CVE-2026-24289 [HIGH] CWE-416 CVE-2026-24289: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally. Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-20871 [HIGH] CWE-416 CVE-2026-20871: Use after free in Desktop Windows Manager allows an authorized attacker to elevate privileges locall Use after free in Desktop Windows Manager allows an authorized attacker to elevate privileges locally.

CVE-2026-20820 [HIGH] CWE-122 CVE-2026-20820: 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-2025-59516 [HIGH] CWE-73 CVE-2025-59516: Missing authentication for critical function in Windows Storage VSP Driver allows an authorized atta Missing authentication for critical function in Windows Storage VSP Driver allows an authorized attacker to elevate privileges locally.

CVE-2025-62454 [HIGH] CWE-122 CVE-2025-62454: Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker t Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-20856 [HIGH] CWE-20 CVE-2026-20856: Improper input validation in Windows Server Update Service allows an unauthorized attacker to execut Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.

CVE-2026-50460 [HIGH] CWE-362 CVE-2026-50460: 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-2026-20921 [HIGH] CWE-362 CVE-2026-20921: 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 Server allows an authorized attacker to elevate privileges over a network.

CVE-2025-58726 [HIGH] CWE-284 CVE-2025-58726: Improper access control in Windows SMB Server allows an authorized attacker to elevate privileges ov Improper access control in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

CVE-2026-20926 [HIGH] CWE-362 CVE-2026-20926: 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 Server allows an authorized attacker to elevate privileges over a network.

CVE-2026-20919 [HIGH] CWE-362 CVE-2026-20919: 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 Server allows an authorized attacker to elevate privileges over a network.

CVE-2026-20934 [HIGH] CWE-362 CVE-2026-20934: 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 Server 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-2025-59199 [HIGH] CWE-284 CVE-2025-59199: Improper access control in Software Protection Platform (SPP) allows an authorized attacker to eleva Improper access control in Software Protection Platform (SPP) allows an authorized attacker to elevate privileges locally.

CVE-2026-20872 [MEDIUM] CWE-73 CVE-2026-20872: External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spo External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.

CVE-2026-49170 [HIGH] CWE-285 CVE-2026-49170: Insufficient granularity of access control in Windows StateRepository API allows an authorized attac Insufficient granularity of access control in Windows StateRepository API allows an authorized attacker to elevate privileges locally.