Vendor advisories

Microsoft Security Response Center

Browse 17,903 advisories from this official source. Search by product, CVE, severity, or advisory ID.

Current Checked 3 hours ago Checked every 6 hours

17,903 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-2026-41097
HighCVSS 6.7

Secure Boot Security Feature Bypass Vulnerability

Reliance on a component that is not updateable in Windows Secure Boot allows an authorized attacker to bypass a security feature 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 versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-41095
HighCVSS 7.8

Data Deduplication Elevation of Privilege Vulnerability

Use after free in Data Deduplication allows an authorized attacker to elevate privileges locally.

Affected productsWindows Server 2025 (Server Core installation), Windows Server 2019 (Server Core installation), Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025
Fixed versions10.0.26100.32860, 10.0.26100.32772, 10.0.17763.8755, 10.0.25398.2330
Vendor guidance

Install KB5087539. Install KB5087423. Install KB5087538. Install KB5087541. Install KB5087537. Install KB5087471. Install KB5087545. Install KB5087424.

Microsoft Security Response CenterCVE-2026-40421
HighCVSS 4.3

Microsoft Word Information Disclosure Vulnerability

Files or directories accessible to external parties in Microsoft Office Word 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, 16.0.5552.1000
Vendor guidance

Click to Run Install KB5002858.

Microsoft Security Response CenterCVE-2026-40420
HighCVSS 8.8

Microsoft Office Click-To-Run Elevation of Privilege Vulnerability

Use after free in Microsoft Office allows an authorized attacker to elevate privileges 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
Vendor guidance

Click to Run

Microsoft Security Response CenterCVE-2026-40419
HighCVSS 7.8

Microsoft Office Click-To-Run Elevation of Privilege Vulnerability

Use after free in Microsoft Office allows an authorized attacker to elevate privileges 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
Vendor guidance

Click to Run

Microsoft Security Response CenterCVE-2026-40418
HighCVSS 7.8

Microsoft Office Click-To-Run Elevation of Privilege Vulnerability

Use after free in Microsoft Office allows an authorized attacker to elevate privileges 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
Vendor guidance

Click to Run

Microsoft Security Response CenterCVE-2026-40415
HighCVSS 8.1

Windows TCP/IP Remote Code Execution Vulnerability

Use after free in Windows TCP/IP allows an unauthorized attacker to execute code 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 versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40414
HighCVSS 7.4

Windows TCP/IP Denial of Service Vulnerability

According to the CVSS score, the attack vector is adjacent (AV:A). What does this mean for this vulnerability? This attack is limited to systems connected to the same network segment as the attacker. The attack cannot be performed across multiple networks (for example, a WAN) ...

Affected productsWindows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022
Fixed versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40413
HighCVSS 7.4

Windows TCP/IP Denial of Service Vulnerability

According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? In this case, a successful attack could be performed from a low privilege Hyper-V guest. The attacker could traverse the guest's security bou...

Affected productsWindows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022
Fixed versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40410
HighCVSS 7.0

Windows SMB Client Elevation of Privilege Vulnerability

Use after free in Windows SMB Client 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 versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40408
HighCVSS 7.8

Windows WAN ARP Driver Elevation of Privilege Vulnerability

Use after free in Windows Kernel-Mode Drivers 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 versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40407
HighCVSS 7.8

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Affected productsWindows Server 2022 (Server Core installation), Windows Server 2019, Windows Server 2022, Windows 10 Version 1809 for 32-bit Systems
Fixed versions10.0.20348.5139, 10.0.20348.5074, 10.0.17763.8755, 10.0.19044.7291
Vendor guidance

Install KB5087545. Install KB5087424. Install KB5087538. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5093998. Install KB5087420. Install ...

Microsoft Security Response CenterCVE-2026-40406
HighCVSS 7.5

Windows TCP/IP Information Disclosure Vulnerability

Use after free in Windows TCP/IP allows an unauthorized 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 versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40405
HighCVSS 7.5

Windows TCP/IP Denial of Service Vulnerability

Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

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 versions10.0.26100.32860, 10.0.26100.32772, 10.0.26200.8457, 10.0.26200.8390
Vendor guidance

Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5089548.

Microsoft Security Response CenterCVE-2026-40401
HighCVSS 7.1

Windows TCP/IP Denial of Service Vulnerability

According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? In this case, a successful attack could be performed from a low privilege Hyper-V guest. The attacker could traverse the guest's security bou...

Affected productsWindows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022
Fixed versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40399
HighCVSS 7.8

Windows TCP/IP Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP 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 versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40398
HighCVSS 7.8

Windows Remote Desktop Services Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Remote Desktop 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 versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install ...

Microsoft Security Response CenterCVE-2026-40397
HighCVSS 7.8

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Affected productsWindows 10 Version 1809 for x64-based Systems, Windows Server 2022, Windows 10 Version 1809 for 32-bit Systems, Windows Server 2022 (Server Core installation)
Fixed versions10.0.17763.8755, 10.0.20348.5139, 10.0.20348.5074, 10.0.19044.7291
Vendor guidance

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087541. Install KB5087420. Install ...

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.

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