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18,545 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-2026-55135
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.
Microsoft Security Response CenterCVE-2026-55133
HighCVSS 7.8
Microsoft OneNote Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office OneNote allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office 365 for Mac, Microsoft Office LTSC for Mac 2021
Fixed versionshttps://aka.ms/OfficeSecurityReleases, 16.111.26071215
Vendor guidance
Click to Run Release Notes
Microsoft Security Response CenterCVE-2026-55131
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-2026-55130
HighCVSS 7.8
Microsoft Word Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.0.5561.1001, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.0.19725.20434
Vendor guidance
Click to Run Install KB5002891. Install KB5002892. Install KB5002883. Install KB5002885. Install KB5002882. Install KB5002890.
Microsoft Security Response CenterCVE-2026-55128
HighCVSS 7.8
Microsoft Word Remote Code Execution Vulnerability
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.0.5561.1001, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215
Vendor guidance
Click to Run Release Notes Install KB5002891. Install KB5002892. Install KB5002883. Install KB5002885. Install KB5002882. Install KB5002890.
Microsoft Security Response CenterCVE-2026-55126
HighCVSS 7.3
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.
Microsoft Security Response CenterCVE-2026-55125
HighCVSS 7.8
Microsoft Office Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.0.5561.1001, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215
Vendor guidance
Click to Run Release Notes Install KB5002891. Install KB5002892. Install KB5002883. Install KB5002885. Install KB5002882. Install KB5002887.
Microsoft Security Response CenterCVE-2026-55122
HighCVSS 7.1
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-2026-55058
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 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-2026-55057
HighCVSS 5.5
Microsoft Office Information Disclosure Vulnerability
Integer overflow or wraparound 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-2026-55055
HighCVSS 7.8
Microsoft Word Remote Code Execution Vulnerability
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Affected productsMicrosoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.0.5561.1001, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215
Vendor guidance
Click to Run Release Notes Install KB5002891. Install KB5002892. Install KB5002883. Install KB5002885. Install KB5002882. Install KB5002890.
Microsoft Security Response CenterCVE-2026-55054
HighCVSS 6.5
Microsoft Excel Information Disclosure Vulnerability
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
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-2026-55052
HighCVSS 8.8
Microsoft SharePoint Elevation of Privilege Vulnerability
Missing authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges 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-2026-55051
HighCVSS 6.5
Microsoft SharePoint Server Information Disclosure Vulnerability
Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to disclose information 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-2026-55048
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Integer overflow or wraparound 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-2026-55047
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 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 KB5002887.
Microsoft Security Response CenterCVE-2026-55046
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 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-2026-55044
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 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-2026-55042
HighCVSS 5.5
Microsoft Office Information Disclosure Vulnerability
Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose information locally.
Affected productsMicrosoft Office 365 for Mac, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems
Fixed versions16.111.26071215, https://aka.ms/OfficeSecurityReleases, 16.0.5561.1000
Vendor guidance
Release Notes Click to Run Install KB5002887.
Microsoft Security Response CenterCVE-2026-55041
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, 16.111.26071215, 16.0.5561.1001
Vendor guidance
Click to Run Release Notes Install KB5002884. Install KB5002886.
Microsoft Security Response CenterCVE-2026-55038
HighCVSS 7.8
Microsoft Word Remote Code Execution Vulnerability
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code 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-2026-55037
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-2026-55036
HighCVSS 7.8
Microsoft Excel Remote Code Execution Vulnerability
Buffer over-read 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-2026-55035
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 SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
Fixed versions16.0.5561.1001, 16.0.10417.20175, https://aka.ms/OfficeSecurityReleases, 16.111.26071215
Vendor guidance
Click to Run Release Notes Install KB5002891. Install KB5002892. Install KB5002883. Install KB5002885. Install KB5002882. Install KB5002887.
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.