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18,544Advisories collected
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18,544 advisories
Each date says whether the vendor published or updated the bulletin. A vendor bulletin describes products that may be affected. It does not prove that the vulnerable product or version is installed in your environment.
Microsoft Security Response CenterCVE-2026-56186
HighCVSS 8.1
Windows Secure Channel Information Disclosure Vulnerability
Out-of-bounds read in Windows Schannel allows an authorized attacker to disclose information over a network.
Affected productsWindows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation)
Fixed versions10.0.17763.9020, 10.0.20348.5386, 10.0.19044.7548, 10.0.19045.7548
Vendor guidance
Install KB5099538. Install KB5099540. Install KB5099539. Install KB5099536. Install KB5101650. Install KB5101649. Install KB5099535. Install KB5099445. Install KB5099444.
Microsoft Security Response CenterCVE-2026-56185
HighCVSS 6.5
Windows Admin Center Information Disclosure Vulnerability
Improper authentication in Windows Admin Center allows an authorized attacker to disclose information over a network.
Affected productsWindows Admin Center
Fixed versions2.6.5.16
Vendor guidance
Release Notes
Microsoft Security Response CenterCVE-2026-56184
HighCVSS 5.5
Win32k Information Disclosure Vulnerability
Exposure of sensitive information to an unauthorized actor in Windows Win32K allows an authorized attacker to disclose information locally.
Affected productsWindows Server 2022, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems
Fixed versions10.0.20348.5386, 10.0.19044.7548, 10.0.19045.7548, 10.0.26100.33158
Vendor guidance
Install KB5099540. Install KB5099539. Install KB5099536. Install KB5101650. Install KB5101649.
Microsoft Security Response CenterCVE-2026-56183
HighCVSS 7.0
Windows MIDI Service Module Elevation of Privileges Vulnerability
Use after free in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
Affected productsWindows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems
Fixed versions10.0.26200.8875, 10.0.26100.8875, 10.0.28000.2525
Vendor guidance
Install KB5101650. Install KB5101649.
Microsoft Security Response CenterCVE-2026-56178
HighCVSS 5.5
Microsoft Defender for Endpoint for Mac Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.
Affected productsMicrosoft Defender for Endpoint for Mac
Fixed versions101.26042.0020
Vendor guidance
Release Notes
Microsoft Security Response CenterCVE-2026-56175
HighCVSS 7.8
Windows NTFS Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
Affected productsWindows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation)
Fixed versions10.0.17763.9020, 10.0.20348.5386, 10.0.19044.7548, 10.0.19045.7548
Vendor guidance
Install KB5099538. Install KB5099540. Install KB5099539. Install KB5099536. Install KB5101650. Install KB5101649. Install KB5099535. Install KB5099445. Install KB5099444.
Microsoft Security Response CenterCVE-2026-56173
HighCVSS 7.0
Windows WebView Elevation of Privilege Vulnerability
Use after free in Windows WebView allows an authorized attacker to elevate privileges locally.
Affected productsWindows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation)
Fixed versions10.0.17763.9020, 10.0.20348.5386, 10.0.19044.7548, 10.0.19045.7548
Vendor guidance
Install KB5099538. Install KB5099540. Install KB5099539. Install KB5099536. Install KB5101650. Install KB5099414. Install KB5101649.
Microsoft Security Response CenterCVE-2026-56170
HighCVSS 7.5
ASP.NET Core Denial of Service Vulnerability
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Affected products.NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Linux, .NET 8.0 runtime installed on Windows, .NET 8.0 runtime installed on Linux
Fixed versions10.0.10, 8.0.29, 9.0.18
Vendor guidance
Install KB5104034. Install KB5104032. Install KB5104033.
Microsoft Security Response CenterCVE-2026-56169
HighCVSS 8.1
Windows Admin Center Elevation of Privilege Vulnerability
Improper authentication in Windows Admin Center allows an authorized attacker to elevate privileges over a network.
Affected productsWindows Admin Center
Fixed versions2.7.4
Vendor guidance
Release Notes
Microsoft Security Response CenterCVE-2026-56168
HighCVSS 6.5
Windows SMB Server Denial of Service Vulnerability
Null pointer dereference in Windows SMB Server allows an authorized attacker to deny service over a network.
Affected productsWindows Server 2022, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems
Fixed versions10.0.20348.5386, 10.0.19044.7548, 10.0.19045.7548, 10.0.26100.33158
Vendor guidance
Install KB5099540. Install KB5099539. Install KB5099536. Install KB5101650. Install KB5101649.
Microsoft Security Response CenterCVE-2026-56157
HighCVSS 5.4
Microsoft SharePoint Server Spoofing Vulnerability
Improper access control in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
Fixed versions16.0.5561.1001, 16.0.10417.20175, 16.0.19725.20434
Vendor guidance
Install KB5002891. Install KB5002883. Install KB5002882.
Microsoft Security Response CenterCVE-2026-56155
HighCVSS 7.8
Active Directory Federation Services Elevation of Privilege Vulnerability
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
Affected productsWindows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation)
Fixed versions10.0.17763.9020, 10.0.20348.5386, 10.0.26100.33158, 10.0.14393.9339
Vendor guidance
Install KB5099538. Install KB5099540. Install KB5099536. Install KB5099535. Install KB5099445. Install KB5099444.
Microsoft Security Response CenterCVE-2026-55949
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected productsOffice Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems
Fixed versions16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215, 16.0.5561.1001
Vendor guidance
Click to Run Release Notes Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55948
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft Office 365 for Mac, Office Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.111.26071215, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.0.5561.1001
Vendor guidance
Release Notes Click to Run Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55947
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft Office 365 for Mac, Office Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.111.26071215, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.0.5561.1001
Vendor guidance
Release Notes Click to Run Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55899
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft Office 365 for Mac, Office Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.111.26071215, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.0.5561.1001
Vendor guidance
Release Notes Click to Run Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55898
HighCVSS 6.1
Microsoft Excel Information Disclosure Vulnerability
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Affected productsMicrosoft Office 365 for Mac, Office Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.111.26071215, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.0.5561.1001
Vendor guidance
Release Notes Click to Run Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55144
HighCVSS 7.1
Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability
Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.
Affected productsWindows Server 2022, Windows Server 2025 (Server Core installation), Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems
Fixed versions10.0.20348.5386, 10.0.26100.33158, 10.0.26200.8875, 10.0.26100.8875
Vendor guidance
Install KB5099540. Install KB5099536. Install KB5101650. Install KB5101649.
Microsoft Security Response CenterCVE-2026-55142
HighCVSS 5.5
Microsoft Word Information Disclosure Vulnerability
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Affected productsMicrosoft Office 365 for Mac, Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft Office 2019 for 32-bit editions
Fixed versions16.111.26071215, 16.0.5561.1001, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases
Vendor guidance
Release Notes Click to Run Install KB5002891. Install KB5002892. Install KB5002883. Install KB5002885. Install KB5002882. Install KB5002890.
Microsoft Security Response CenterCVE-2026-55141
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected productsOffice Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems
Fixed versions16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215, 16.0.5561.1001
Vendor guidance
Click to Run Release Notes Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55139
HighCVSS 5.5
Microsoft Office Information Disclosure Vulnerability
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Affected productsMicrosoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems
Fixed versionshttps://aka.ms/OfficeSecurityReleases, 16.111.26071215, 16.0.5561.1000
Vendor guidance
Click to Run Release Notes Install KB5002887.
Microsoft Security Response CenterCVE-2026-55138
HighCVSS 5.5
Microsoft Excel Information Disclosure Vulnerability
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Affected productsOffice Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems
Fixed versions16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215, 16.0.5561.1001
Vendor guidance
Click to Run Release Notes Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55136
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected productsOffice Online Server, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems
Fixed versions16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215, 16.0.5561.1001
Vendor guidance
Click to Run Release Notes Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55135
HighCVSS 4.6
Microsoft SharePoint Server Spoofing Vulnerability
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.
Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
Fixed versions16.0.5561.1001, 16.0.10417.20175, 16.0.19725.20434
Vendor guidance
Install KB5002891. Install KB5002883. Install KB5002882.
Before you act
Start with the vendor's bulletin.
We normalize the fields that vendors publish so you can search and compare advisories in one place. We do not replace the original bulletin or turn a product-name match into proof that a system is vulnerable.
Confirm the installed product and version, read the linked vendor guidance, and test the recommended update or mitigation through your normal change process.