CVE-2026-21519

Desktop Window Manager Elevation of Privilege Vulnerability

Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS 2.6% KEV · Listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 22 more

CVE-2026-21235

Windows Graphics Component Elevation of Privilege Vulnerability

Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 18 more

CVE-2026-21248

Windows Hyper-V Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.

CVSS 3.1 · 7.3 High EPSS 1.3% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 22 more

CVE-2026-21247

Windows Hyper-V Remote Code Execution Vulnerability

Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 22 more

CVE-2026-21242

Windows Subsystem for Linux Elevation of Privilege Vulnerability

Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 and 16 more

CVE-2026-21234

Windows Connected Devices Platform Service Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Connected Devices Platform Service allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1809 Windows 10 21h2 Windows 10 21h2 and 19 more

CVE-2026-21236

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 27 more

CVE-2026-21510

Windows Shell Security Feature Bypass Vulnerability

Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

CVSS 3.1 · 8.8 High EPSS 61.2% KEV · Listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 27 more

CVE-2026-21508

Windows Storage Elevation of Privilege Vulnerability

Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 27 more

CVE-2026-21255

Windows Hyper-V Security Feature Bypass Vulnerability

Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 22 more

CVE-2026-21253

Mailslot File System Elevation of Privilege Vulnerability

Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 27 more

CVE-2026-21250

Windows HTTP.sys Elevation of Privilege Vulnerability

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS 1.1% KEV · Not listed

Vendors

Microsoft

Products

Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 and 8 more

CVE-2026-21249

Windows NTLM Spoofing Vulnerability

External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing locally.

CVSS 3.1 · 3.3 Low EPSS 11.3% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 26 more

CVE-2026-21245

Windows Kernel Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 and 5 more

CVE-2026-21244

Windows Hyper-V Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.

CVSS 3.1 · 7.3 High EPSS 1.3% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 22 more

CVE-2026-21240

Windows HTTP.sys Elevation of Privilege Vulnerability

Time-of-check time-of-use (toctou) race condition in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1809 Windows 10 21h2 Windows 10 21h2 and 19 more

CVE-2026-21241

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7 High EPSS 2.6% KEV · Not listed

Vendors

Microsoft

Products

Windows 11 22h3 Windows 11 23h2 Windows 11 23h2 and 12 more

CVE-2026-21238

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS 3.3% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 27 more

CVE-2026-21237

Windows Subsystem for Linux Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 and 16 more

CVE-2026-21232

Windows HTTP.sys Elevation of Privilege Vulnerability

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Microsoft

Products

Windows 11 22h3 Windows 11 23h2 Windows 11 23h2 and 11 more