Microsoft Windows 11 Version 26H1 vulnerabilities

741 known vulnerabilities affecting microsoft/windows_11_version_26h1.

Total CVEs

741

CISA KEV

actively exploited

Public exploits

Exploited in wild

Severity breakdown

CRITICAL23HIGH567MEDIUM146LOW5

Vulnerabilities

SortPage 20 of 38

CVE-2026-50496P3HIGHCVSS 7.5≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-50496 [HIGH] CWE-125 CVE-2026-50496: Out-of-bounds read in Windows Network Policy Server SNMP allows an unauthorized attacker to disclose Out-of-bounds read in Windows Network Policy Server SNMP allows an unauthorized attacker to disclose information over a network.

nvd

CVE-2026-45607P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.22692026-06-09

CVE-2026-45607 [HIGH] CWE-125 CVE-2026-45607: Out-of-bounds read in Windows Hyper-V allows an unauthorized attacker to execute code locally. Out-of-bounds read in Windows Hyper-V allows an unauthorized attacker to execute code locally.

nvd

CVE-2026-40404P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.22692026-06-09

CVE-2026-40404 [HIGH] CWE-122 CVE-2026-40404: Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

nvd

CVE-2026-24290P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.17192026-03-10

CVE-2026-24290 [HIGH] CWE-284 CVE-2026-24290: Improper access control in Windows Projected File System allows an authorized attacker to elevate pr Improper access control in Windows Projected File System allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-40405P3HIGHCVSS 7.5≥ 10.0.28000.0, < 10.0.28000.21132026-05-12

CVE-2026-40405 [HIGH] CWE-476 CVE-2026-40405: Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a ne Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

nvd

CVE-2026-42837P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.22692026-06-09

CVE-2026-42837 [HIGH] CWE-125 CVE-2026-42837: Out-of-bounds read in Windows Projected File System Filter Driver allows an authorized attacker to e Out-of-bounds read in Windows Projected File System Filter Driver allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-42828P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.22692026-06-09

CVE-2026-42828 [HIGH] CWE-126 CVE-2026-42828: Buffer over-read in Windows Projected File System Filter Driver allows an authorized attacker to ele Buffer over-read in Windows Projected File System Filter Driver allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-50647P3HIGHCVSS 7.5≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-50647 [HIGH] CWE-835 CVE-2026-50647: Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD F Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

nvd

CVE-2026-50315P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-50315 [HIGH] CWE-476 CVE-2026-50315: Null pointer dereference in Windows Image Acquisition allows an authorized attacker to elevate privi Null pointer dereference in Windows Image Acquisition allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-54115P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-54115 [HIGH] CWE-122 CVE-2026-54115: Integer overflow or wraparound in Windows Active Directory allows an authorized attacker to elevate Integer overflow or wraparound in Windows Active Directory allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-40409P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.22692026-06-09

CVE-2026-40409 [HIGH] CWE-197 CVE-2026-40409: Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

nvd

CVE-2026-27907P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.18362026-04-14

CVE-2026-27907 [HIGH] CWE-191 CVE-2026-27907: Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized att Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-45592P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.22692026-06-09

CVE-2026-45592 [HIGH] CWE-190 CVE-2026-45592: Integer overflow or wraparound in Windows Internet (wininet.dll) allows an authorized attacker to el Integer overflow or wraparound in Windows Internet (wininet.dll) allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-26153P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.18362026-04-14

CVE-2026-26153 [HIGH] CWE-125 CVE-2026-26153: Out-of-bounds read in Windows Encrypting File System (EFS) allows an authorized attacker to elevate Out-of-bounds read in Windows Encrypting File System (EFS) allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-42896P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.21132026-05-12

CVE-2026-42896 [HIGH] CWE-122 CVE-2026-42896: Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-50335P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-50335 [HIGH] CWE-284 CVE-2026-50335: Improper access control in Windows Operating Systems allows an authorized attacker to elevate privil Improper access control in Windows Operating Systems allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-33834P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.21132026-05-12

CVE-2026-33834 [HIGH] CWE-284 CVE-2026-33834: Improper access control in Windows Event Logging Service allows an authorized attacker to elevate pr Improper access control in Windows Event Logging Service allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-50498P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-50498 [HIGH] CWE-125 CVE-2026-50498: Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

nvd

CVE-2026-50491P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-50491 [HIGH] CWE-125 CVE-2026-50491: Out-of-bounds read in Code Integrity DLL (ci.dll) allows an authorized attacker to elevate privilege Out-of-bounds read in Code Integrity DLL (ci.dll) allows an authorized attacker to elevate privileges locally.

nvd

CVE-2026-49790P3HIGHCVSS 7.8≥ 10.0.28000.0, < 10.0.28000.25252026-07-14

CVE-2026-49790 [HIGH] CWE-122 CVE-2026-49790: Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

nvd

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