Vendor advisories

Microsoft Security Response Center

Browse 15,985 advisories from this official source. Search by product, CVE, severity, or advisory ID.

Current Checked 18 minutes ago Checked every 6 hours

15,985 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.

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Microsoft Security Response CenterCVE-2026-62917
HighCVSS 4.6

Microsoft SharePoint Server Spoofing Vulnerability

Improper input validation 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 versions16.0.5565.1001, 16.0.10417.20198, 16.0.19725.20522
Vendor guidance

Install KB5002905. Install KB5002906. Install KB5002894. Install KB5002896. Install KB5002893.

Microsoft Security Response CenterCVE-2026-62839
HighCVSS 6.5

Microsoft SharePoint Server Spoofing Vulnerability

Insufficiently protected credentials 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 versions16.0.5565.1001, 16.0.10417.20198, 16.0.19725.20522
Vendor guidance

Install KB5002905. Install KB5002906. Install KB5002894. Install KB5002896. Install KB5002893.

Microsoft Security Response CenterCVE-2026-58639
HighCVSS 6.5

Microsoft SharePoint Server Spoofing Vulnerability

Server-side request forgery (ssrf) 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 versions16.0.5565.1001, 16.0.10417.20198, 16.0.19725.20522
Vendor guidance

Install KB5002905. Install KB5002906. Install KB5002894. Install KB5002896. Install KB5002893.

Microsoft Security Response CenterCVE-2026-62738
HighCVSS 5.5

Windows Management Instrumentation Information Disclosure Vulnerability

Out-of-bounds read in Windows Management Instrumentation allows an authorized attacker to disclose information 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 versions10.0.17763.9121, 10.0.20348.5499, 10.0.20348.5440, 10.0.19044.7663
Vendor guidance

Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120249. Install KB5120233. Install KB5120228. Install KB5121003. Install KB5120994. Install KB5120240. Install KB5121000. Install KB5120418. Install ...

Microsoft Security Response CenterCVE-2026-70306
HighCVSS 9.3

Microsoft Office SharePoint Spoofing Vulnerability

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

Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
Fixed versions16.0.5565.1001, 16.0.10417.20198, 16.0.19725.20522
Vendor guidance

Install KB5002905. Install KB5002894. Install KB5002893.

Microsoft Security Response CenterCVE-2026-68814
HighCVSS 7.8

Microsoft Excel Remote Code Execution Vulnerability

Out-of-bounds read 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 versions16.112.26081010, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.0.5565.1001
Vendor guidance

Release Notes Click to Run Install KB5002884. Install KB5002903.

Microsoft Security Response CenterCVE-2026-68805
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 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, 16.112.26081010, 16.0.5565.1001
Vendor guidance

Click to Run Release Notes Install KB5002884. Install KB5002903.

Microsoft Security Response CenterCVE-2026-68803
HighCVSS 7.8

Microsoft Excel Remote Code Execution Vulnerability

Access of resource using incompatible type ('type confusion') 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, 16.112.26081010, 16.0.5565.1001
Vendor guidance

Click to Run Release Notes Install KB5002884. Install KB5002903.

Microsoft Security Response CenterCVE-2026-68799
HighCVSS 5.5

Microsoft Excel Information Disclosure Vulnerability

Use of uninitialized resource 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, 16.112.26081010, 16.0.5565.1001
Vendor guidance

Click to Run Release Notes Install KB5002884. Install KB5002903.

Microsoft Security Response CenterCVE-2026-68797
HighCVSS 5.5

Microsoft Excel Information Disclosure Vulnerability

Out-of-bounds read 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, 16.112.26081010, 16.0.5565.1001
Vendor guidance

Click to Run Release Notes Install KB5002884. Install KB5002903.

Microsoft Security Response CenterCVE-2026-66810
HighCVSS 5.5

Microsoft Office Word Information Disclosure Vulnerability

Heap-based buffer overflow 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, 16.112.26081010, 16.0.5565.1000
Vendor guidance

Click to Run Release Notes Install KB5002901.

Microsoft Security Response CenterCVE-2026-66808
HighCVSS 8.8

Microsoft SharePoint Server Remote Code Execution Vulnerability

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
Fixed versions16.0.5565.1001, 16.0.10417.20198, 16.0.19725.20522
Vendor guidance

Install KB5002905. Install KB5002906. Install KB5002894. Install KB5002896. Install KB5002893.

Microsoft Security Response CenterCVE-2026-66806
HighCVSS 5.5

Microsoft Office Word Information Disclosure Vulnerability

Off-by-one error 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, 16.0.5565.1000
Vendor guidance

Click to Run Install KB5002901.

Microsoft Security Response CenterCVE-2026-65810
HighCVSS 7.8

.NET Framework Elevation of Privilege Vulnerability

Relative path traversal in .NET Framework allows an unauthorized attacker to elevate privileges locally.

Affected productsMicrosoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems, Microsoft .NET Framework 4.8.1 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 3.5 on Windows 11 Version 26H1 for ARM64-based Systems
Fixed versions4.8.9344.0, 2.0.50727.9183 & 3.0.30729.9169, 4.8.4805.0, 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0
Vendor guidance

Install KB5120711. Install KB5120747. Install KB5120702. Install KB5120704. Install KB5120706. Install KB5120703. Install KB5120705. Install KB5120701. Install KB5120698. Install KB5120418. Install KB5120699. Install ...

Microsoft Security Response CenterCVE-2026-65798
HighCVSS 6.7

Windows DNS Elevation of Privilege Vulnerability

Numeric truncation error in Windows DNS 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 versions10.0.17763.9121, 10.0.20348.5499, 10.0.20348.5440, 10.0.19044.7663
Vendor guidance

Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120249. Install KB5120233. Install KB5120228. Install KB5121003. Install KB5120994. Install KB5120240. Install KB5121000. Install KB5120418. Install ...

Microsoft Security Response CenterCVE-2026-65799
HighCVSS 6.7

Windows DNS Elevation of Privilege Vulnerability

Integer overflow or wraparound in Windows DNS 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 versions10.0.17763.9121, 10.0.20348.5499, 10.0.20348.5440, 10.0.19044.7663
Vendor guidance

Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120249. Install KB5120233. Install KB5120228. Install KB5121003. Install KB5120994. Install KB5120240. Install KB5121000. Install KB5120418. Install ...

Microsoft Security Response CenterCVE-2026-65797
HighCVSS 6.7

Windows DNS Elevation of Privilege Vulnerability

Numeric truncation error in Windows DNS 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 versions10.0.17763.9121, 10.0.20348.5499, 10.0.20348.5440, 10.0.19044.7663
Vendor guidance

Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120249. Install KB5120233. Install KB5120228. Install KB5121003. Install KB5120994. Install KB5120240. Install KB5121000. Install KB5120418. Install ...

Microsoft Security Response CenterCVE-2026-65794
HighCVSS 6.5

Windows SMB Client Information Disclosure Vulnerability

Buffer over-read in Windows SMB Client 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 versions10.0.17763.9121, 10.0.20348.5499, 10.0.20348.5440, 10.0.19044.7663
Vendor guidance

Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120249. Install KB5120233. Install KB5120228. Install KB5121003. Install KB5120994. Install KB5120240. Install KB5121000. Install KB5120418. Install ...

Microsoft Security Response CenterCVE-2026-65790
HighCVSS 7.8

Windows Message Queuing Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Message Queuing 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 versions10.0.17763.9121, 10.0.20348.5499, 10.0.20348.5440, 10.0.19044.7663
Vendor guidance

Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120249. Install KB5120233. Install KB5120228. Install KB5121003. Install KB5120994. Install KB5120240. Install KB5121000. Install KB5120418. Install ...

Microsoft Security Response CenterCVE-2026-65781
HighCVSS 7.0

Windows Autopilot Elevation of Privilege Vulnerability

Use after free in Windows Autopilot 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 versions10.0.26200.9168, 10.0.26200.9106, 10.0.26100.9168, 10.0.26100.9106
Vendor guidance

Install KB5121003. Install KB5120994.

Microsoft Security Response CenterCVE-2026-65782
HighCVSS 7.0

Windows Autopilot Elevation of Privilege Vulnerability

Use after free in Windows Autopilot 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 versions10.0.26200.9168, 10.0.26200.9106, 10.0.26100.9168, 10.0.26100.9106
Vendor guidance

Install KB5121003. Install KB5120994.

Microsoft Security Response CenterCVE-2026-65778
HighCVSS 7.0

Windows Autopilot Elevation of Privilege Vulnerability

Use after free in Windows Autopilot 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 versions10.0.26200.9168, 10.0.26200.9106, 10.0.26100.9168, 10.0.26100.9106
Vendor guidance

Install KB5121003. Install KB5120994.

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Start with the vendor's bulletin.

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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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