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KB5002910: what it fixes and who gets it

KB5002910 is a security update from Microsoft's September 2026 release for Office Online Server.

Microsoft data read
4CVEs fixed
0rated Critical
0already exploited
Norestart required

Should you install it?

Yes. It is a routine security update; none of its fixes are rated Critical or reported as exploited. Windows Update installs it automatically on supported home PCs.

If the installation fails or the PC misbehaves afterwards, note the exact error code first: the fix depends on it. Our update troubleshooting guides are linked on this page.

Security fixes in KB5002910

CVETypeCVSSSeverity
CVE-2026-81947Microsoft Excel Remote Code Execution VulnerabilityRemote Code Execution7.8Important
CVE-2026-81956Microsoft Excel Remote Code Execution VulnerabilityRemote Code Execution7.8Important
CVE-2026-81390Microsoft Excel Information Disclosure VulnerabilityInformation Disclosure5.5Important
CVE-2026-81401Microsoft Excel Information Disclosure VulnerabilityInformation Disclosure5.5Important

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