Vendor advisories

Microsoft Security Response Center

Browse 17,484 advisories from this official source. Search by product, CVE, severity, or advisory ID.

Current Checked 3 hours ago Checked every 6 hours

17,484 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.

RSS for these results
Microsoft Security Response CenterCVE-2026-50458
HighCVSS 7.8

Microsoft Brokering File System Elevation of Privilege Vulnerability

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

Affected productsWindows Server 2025 (Server Core installation), Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems
Fixed versions10.0.26100.33158, 10.0.26200.8875, 10.0.26100.8875, 10.0.28000.2525
Vendor guidance

Install KB5099536. Install KB5101650. Install KB5101649.

Microsoft Security Response CenterCVE-2026-50407
HighCVSS 7.8

Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Resilient File System (ReFS) 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.

Microsoft Security Response CenterCVE-2026-50377
HighCVSS 5.5

Windows Kernel Elevation of Privilege Vulnerability

Out-of-bounds read in Windows Kernel 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 KB5099535. Install KB5101649.

Microsoft Security Response CenterCVE-2026-58640
HighCVSS 7.3

Windows NTFS Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code 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. Install KB5099535. Install KB5099445. Install KB5099444.

Microsoft Security Response CenterCVE-2026-50653
HighCVSS 7.5

Azure Active Directory Denial of Service Vulnerability

Loop with unreachable exit condition ('infinite loop') in Azure Active Directory allows an unauthorized attacker to deny service over a network.

Affected productsAzure Active Directory, Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems, Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems, Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems
Fixed versions8.19.2, 7.7.3, 5.7.1, 2.0.50727.9182 & 3.0.30729.9168
Vendor guidance

Release Notes Install KB5101014. Install KB5101002. Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install KB5101006. Install KB5100989. Install KB5099535. Install KB510...

Microsoft Security Response CenterCVE-2026-50652
HighCVSS 7.5

Azure Active Directory Denial of Service Vulnerability

Deserialization of untrusted data in Azure Active Directory allows an unauthorized attacker to deny service over a network.

Affected productsAzure Active Directory, Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems, Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems, Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems
Fixed versions5.7.1, 7.7.3, 8.19.2, 2.0.50727.9182 & 3.0.30729.9168
Vendor guidance

Release Notes Install KB5101014. Install KB5101002. Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install KB5101006. Install KB5100989. Install KB5099535. Install KB510...

Microsoft Security Response CenterCVE-2026-50649
HighCVSS 7.8

.NET Remote Code Execution Vulnerability

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code locally.

Affected products.NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Windows, Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems, Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems
Fixed versions8.0.29, 9.0.18, 2.0.50727.9182 & 3.0.30729.9168, 4.8.9340.0
Vendor guidance

Release Notes Install KB5104032. Install KB5104033. Install KB5101014. Install KB5101002. Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install KB5101006. Install KB510...

Microsoft Security Response CenterCVE-2026-50647
HighCVSS 7.5

Active Directory Federation Server Denial of Service Vulnerability

Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service 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. Install KB5101007. Install KB5101009. Install ...

Microsoft Security Response CenterCVE-2026-50525
HighCVSS 7.5

.NET Denial of Service Vulnerability

Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny service over a network.

Affected productsMicrosoft Visual Studio 2022 version 17.12, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Linux, .NET 8.0 runtime installed on Windows
Fixed versions17.12.22, 10.0.10, 8.0.29, 17.14.36
Vendor guidance

Release Notes Install KB5104034. Install KB5104032. Install KB5104033. Install KB5101014. Install KB5101002. Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install KB510...

Microsoft Security Response CenterCVE-2026-50411
HighCVSS 7.5

Windows Active Directory Federation Services Denial of Service Vulnerability

Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service 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. Install KB5101007. Install KB5101009. Install ...

Microsoft Security Response CenterCVE-2026-50368
HighCVSS 7.5

Windows Active Directory Federation Services Denial of Service Vulnerability

Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service 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, 10.0.26100.33158, 10.0.14393.9339
Vendor guidance

Install KB5099538. Install KB5099540. Install KB5099536. Install KB5099535. Install KB5099445. Install KB5099444. Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install ...

Microsoft Security Response CenterCVE-2026-50355
HighCVSS 7.5

Windows Active Directory Federation Services Denial of Service Vulnerability

Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.

Affected productsMicrosoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
Fixed versions4.8.4803.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0, 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
Vendor guidance

Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install KB5101006. Install KB5100989. Install KB5099535. Install KB5100990. Install KB5100991. Install KB5101005. Install ...

Microsoft Security Response CenterCVE-2026-50324
HighCVSS 5.9

Windows Active Directory Federation Services Denial of Service Vulnerability

Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service 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, 10.0.26100.33158, 10.0.14393.9339
Vendor guidance

Install KB5099538. Install KB5099540. Install KB5099536. Install KB5099535. Install KB5099444. Install KB5101002. Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install ...

Microsoft Security Response CenterCVE-2026-50304
HighCVSS 7.5

Windows Active Directory Federation Services Denial of Service Vulnerability

Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.

Affected productsMicrosoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
Fixed versions4.8.4803.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0, 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
Vendor guidance

Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install KB5101006. Install KB5100989. Install KB5099535. Install KB5100990. Install KB5100991. Install KB5101005. Install ...

Microsoft Security Response CenterCVE-2026-47304
HighCVSS 8.1

.NET Security Feature Bypass Vulnerability

Improper verification of cryptographic signature in .NET allows an unauthorized attacker to bypass a security feature 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, 17.14.36
Vendor guidance

Release Notes Install KB5104034. Install KB5104032. Install KB5104033. Install KB5101007. Install KB5101009. Install KB5101011. Install KB5101008. Install KB5101010. Install KB5101006. Install KB5100989. Install KB509...

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.

How we check our sources