Microsoft Patch Tuesday · April 2026

Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.

Listed in CISA KEV

Improper neutralization of escape, meta, or control sequences in Microsoft Power Apps allows an authorized attacker to perform spoofing over a network.

Integer size truncation in Windows Advanced Rasterization Platform (WARP) allows an unauthorized attacker to elevate privileges locally.

Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Improper neutralization of special elements used in a command ('command injection') in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

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

Improper input validation in Windows Hello allows an unauthorized attacker to bypass a security feature over a network.

Acceptance of extraneous untrusted data with trusted data in Windows COM allows an unauthorized attacker to elevate privileges locally.

Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code locally.

Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Brokering File System allows an unauthorized attacker to elevate privileges locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an unauthorized attacker to execute code over a network.

Improper authorization in Windows Kerberos allows an authorized attacker to elevate privileges over an adjacent network.

Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.

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

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.

Out-of-bounds read in Windows Encrypting File System (EFS) allows an authorized attacker to elevate privileges locally.

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

Missing authentication for critical function in Windows Remote Desktop Licensing Service allows an authorized attacker to elevate privileges locally.

Missing authentication for critical function in Windows Remote Desktop Licensing Service allows an authorized attacker to elevate privileges locally.

Untrusted pointer dereference in Windows Sensor Data Service allows an authorized attacker to elevate privileges locally.

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

Double free in Windows Kernel allows an authorized attacker to elevate privileges locally.

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

Improper input validation in Microsoft PowerShell allows an authorized attacker to elevate privileges locally.

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

Heap-based buffer overflow in Windows Client Side Caching driver (csc.sys) allows an authorized attacker to elevate privileges locally.

Double free in Windows Kernel allows an authorized attacker to elevate privileges locally.

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

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

Improper access control in Windows RPC API allows an authorized attacker to elevate privileges locally.

Buffer over-read in Windows Projected File System allows an authorized attacker to elevate privileges locally.

Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.

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

Improper handling of insufficient permissions or privileges in Windows Installer allows an authorized attacker to elevate privileges locally.

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

Improper access control in Microsoft Management Console allows an authorized attacker to elevate privileges locally.

Use after free in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges locally.

Use after free in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges locally.

Untrusted pointer dereference in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges locally.

Untrusted pointer dereference in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges locally.

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Double free in Windows Projected File System allows an authorized attacker to elevate privileges locally.

Double free in Windows Projected File System allows an authorized attacker to elevate privileges locally.

Out-of-bounds read in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.

Untrusted pointer dereference in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges locally.

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

Use after free in Windows Speech Brokered Api allows an authorized attacker to elevate privileges locally.

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Use after free in Microsoft Windows Speech allows an authorized attacker to elevate privileges locally.

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

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

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

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

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

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

Use after free in Windows User Interface Core allows an authorized attacker to elevate privileges locally.

Improper neutralization of special elements used in an sql command ('sql injection') in SQL Server allows an authorized attacker to elevate privileges locally.

Improper neutralization of special elements used in an sql command ('sql injection') in SQL Server allows an authorized attacker to elevate privileges locally.

Improper neutralization of special elements used in a command ('command injection') in Windows Snipping Tool allows an unauthorized attacker to execute code locally.

Deserialization of untrusted data in Microsoft High Performance Compute Pack (HPC) allows an authorized attacker to elevate privileges locally.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code locally.

Untrusted pointer dereference in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Use after free in Windows Container Isolation FS Filter Driver allows an authorized attacker to elevate privileges locally.

Use after free in Windows Print Spooler Components allows an authorized attacker to elevate privileges locally.

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

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

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

Improper input validation in Windows BitLocker allows an unauthorized attacker to bypass a security feature locally.

Null pointer dereference in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.

Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to deny service over a network.

A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use.

Use after free in Windows Universal Plug and Play (UPnP) Device Host allows an unauthorized attacker to execute code locally.

Git for Windows is the Windows port of Git.

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

Insufficient ui warning of dangerous operations in Windows Remote Desktop allows an unauthorized attacker to perform spoofing over a network.

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Applocker Filter Driver (applockerfltr.sys) allows an authorized attacker to elevate privileges locally.

Insecure storage of sensitive information in Windows Cryptographic Services allows an authorized attacker to elevate privileges locally.

Use after free in Windows Shell allows an authorized attacker to elevate privileges locally.

Double free in Windows Shell allows an authorized attacker to elevate privileges locally.

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

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

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

Use after free in Windows TDI Translation Driver (tdx.sys) allows an authorized attacker to elevate privileges locally.

Use after free in Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys) allows an authorized attacker to elevate privileges locally.

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

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

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

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

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

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

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

Use after free in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges locally.

Use after free in Windows WalletService allows an authorized attacker to elevate privileges locally.

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

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

Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.

Heap-based buffer overflow in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.

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

Double free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.

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

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

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

Heap-based buffer overflow in Windows USB Print Driver allows an unauthorized attacker to elevate privileges with a physical attack.

Reliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.

Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio Code allows an authorized attacker to disclose information over a network.

Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability

Use after free in Windows Universal Plug and Play (UPnP) Device Host allows an unauthorized attacker to disclose information over an adjacent network.

Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to disclose information over a network.

Improper authentication in Windows Active Directory allows an unauthorized attacker to perform spoofing locally.

Buffer over-read in Windows Kernel Memory allows an authorized attacker to disclose information locally.

Improper neutralization of input during web page generation ('cross-site scripting') in Windows Admin Center allows an unauthorized attacker to perform spoofing over a network.

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Biometric Service allows an unauthorized attacker to bypass a security feature with a physical attack.

EAZ EazyFix 12.9 allows a Security Feature Bypass related to a "Missing Cryptographic Step" associated with "Secure Boot disable."

Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to bypass a security feature locally.

Access of resource using incompatible type ('type confusion') in Windows COM allows an authorized attacker to disclose information locally.

Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information locally.

Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information locally.

Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.

Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.

Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.

Exposure of sensitive information to an unauthorized actor in Windows Remote Procedure Call allows an authorized attacker to disclose information locally.

Improper privilege management in Microsoft Windows allows an authorized attacker to deny service locally.

Improper link resolution before file access ('link following') in Universal Plug and Play (upnp.dll) allows an authorized attacker to disclose information locally.

Improper access control in Universal Plug and Play (upnp.dll) allows an authorized attacker to disclose information locally.

Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally.

Null pointer dereference in Windows Redirected Drive Buffering allows an authorized attacker to deny service locally.

Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally.

Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally.

Insufficient checks of the RMP on host buffer access in IOMMU may allow an attacker with privileges and a compromised hypervisor to trigger an out of bounds condition without RMP checks, resulting in a potential loss of confidential guest integrity.

Improper removal of sensitive information before storage or transfer in Windows Recovery Environment Agent allows an unauthorized attacker to bypass a security feature with a physical attack.

Use of uninitialized resource in Windows Boot Manager allows an unauthorized attacker to bypass a security feature with a physical attack.

Improper input validation in Windows Hello allows an authorized attacker to bypass a security feature locally.

Improper access control in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to bypass a security feature locally.

Exposure of sensitive information to an unauthorized actor in Windows Snipping Tool allows an unauthorized attacker to perform spoofing over a network.

Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.

Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.

Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.

Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a network.

Loop with unreachable exit condition ('infinite loop') in .NET, .NET Framework, Visual Studio allows an unauthorized attacker to deny service over a network.

Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.

Insufficiently protected credentials in Azure Logic Apps allows an authorized attacker to elevate privileges over a network.

Improper input validation in Azure Monitor Agent allows an authorized attacker to elevate privileges locally.

Deserialization of untrusted data in Azure Monitor Agent allows an authorized attacker to elevate privileges locally.

Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

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

Use after free in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

Untrusted pointer dereference in SQL Server allows an authorized attacker to execute code over a network.

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.

Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.

Listed in CISA KEVPublicly disclosed

Improper access control in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to disclose information locally.

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.