Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-49805 [HIGH] CWE-284 CVE-2026-49805: Improper access control in Windows Win32K allows an authorized attacker to elevate privileges locall Improper access control in Windows Win32K allows an authorized attacker to elevate privileges locally.

CVE-2026-83510 [HIGH] CWE-367 CVE-2026-83510: Time-of-check time-of-use (toctou) race condition in Windows Setup Files Cleanup allows an authorize Time-of-check time-of-use (toctou) race condition in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.

CVE-2026-71347 [HIGH] CWE-362 CVE-2026-71347: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Security Center allows an authorized attacker to elevate privileges locally.

CVE-2026-85943 [HIGH] CWE-122 CVE-2026-85943: Time-of-check time-of-use (toctou) race condition in Reliable Multicast Transport Driver (RMCAST) al Time-of-check time-of-use (toctou) race condition in Reliable Multicast Transport Driver (RMCAST) allows an authorized attacker to elevate privileges locally.

CVE-2026-83839 [HIGH] CWE-367 CVE-2026-83839: Time-of-check time-of-use (toctou) race condition in Windows Hyper-V allows an authorized attacker t Time-of-check time-of-use (toctou) race condition in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

CVE-2026-83868 [HIGH] CWE-362 CVE-2026-83868: Concurrent execution using shared resource with improper synchronization ('race condition') in Micro Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Bluetooth Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-69779 [HIGH] CWE-367 CVE-2026-69779: Time-of-check time-of-use (toctou) race condition in Windows Win32K allows an authorized attacker to Time-of-check time-of-use (toctou) race condition in Windows Win32K allows an authorized attacker to elevate privileges locally.

CVE-2026-62728 [HIGH] CWE-125 CVE-2026-62728: Time-of-check time-of-use (toctou) race condition in Windows Common Log File System Driver allows an Time-of-check time-of-use (toctou) race condition in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-50356 [HIGH] CWE-362 CVE-2026-50356: Concurrent execution using shared resource with improper synchronization ('race condition') in Micro Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Windows App Store allows an authorized attacker to elevate privileges locally.

CVE-2026-49784 [HIGH] CWE-362 CVE-2026-49784: Concurrent execution using shared resource with improper synchronization ('race condition') in Micro Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Windows App Store allows an authorized attacker to elevate privileges locally.

CVE-2026-88149 [HIGH] CWE-415 CVE-2026-88149: Double free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevat Double free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-34341 [HIGH] CWE-415 CVE-2026-34341: Double free in Windows Link-Layer Discovery Protocol (LLDP) allows an authorized attacker to elevate Double free in Windows Link-Layer Discovery Protocol (LLDP) allows an authorized attacker to elevate privileges locally.

CVE-2026-84018 [HIGH] CWE-367 CVE-2026-84018: Use after free in Windows Print Spooler Components allows an authorized attacker to elevate privileg Use after free in Windows Print Spooler Components allows an authorized attacker to elevate privileges locally.

CVE-2026-25184 [HIGH] CWE-362 CVE-2026-25184: Concurrent execution using shared resource with improper synchronization ('race condition') in Applo Concurrent execution using shared resource with improper synchronization ('race condition') in Applocker Filter Driver (applockerfltr.sys) allows an authorized attacker to elevate privileges locally.

CVE-2026-32086 [HIGH] CWE-362 CVE-2026-32086: Concurrent execution using shared resource with improper synchronization ('race condition') in Funct Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.

CVE-2026-32150 [HIGH] CWE-362 CVE-2026-32150: Concurrent execution using shared resource with improper synchronization ('race condition') in Funct Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.

CVE-2026-32091 [HIGH] CWE-362 CVE-2026-32091: Concurrent execution using shared resource with improper synchronization ('race condition') in Micro Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Brokering File System allows an unauthorized attacker to elevate privileges locally.

CVE-2026-87710 [HIGH] CWE-362 CVE-2026-87710: Improper access control in Microsoft Local Security Authority Server (lsasrv) allows an authorized a Improper access control in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to elevate privileges locally.

CVE-2026-72942 [MEDIUM] CWE-125 CVE-2026-72942: Out-of-bounds read in Windows Spaceport.sys allows an unauthorized attacker to disclose information Out-of-bounds read in Windows Spaceport.sys allows an unauthorized attacker to disclose information over a network.

CVE-2026-54126 [MEDIUM] CWE-125 CVE-2026-54126: Out-of-bounds read in Windows RDP allows an unauthorized attacker to disclose information over a net Out-of-bounds read in Windows RDP allows an unauthorized attacker to disclose information over a network.