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KB5002919: what it fixes and who gets it

KB5002919 is a security update from Microsoft's September 2026 release for Microsoft Outlook 2016 (32-bit edition), Microsoft Outlook 2016 (64-bit edition).

Microsoft data read
3CVEs fixed
1rated Critical
0already exploited
Norestart required

Should you install it?

Yes. It closes holes Microsoft rates Critical, the most serious rating it uses. 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 KB5002919

CVETypeCVSSSeverity
CVE-2026-78519Microsoft Office Outlook Remote Code Execution VulnerabilityRemote Code Execution8.8Critical
CVE-2026-69629Microsoft Office Outlook Remote Code Execution VulnerabilityRemote Code Execution8.8Important
CVE-2026-80073Microsoft Office Outlook Information Disclosure VulnerabilityInformation Disclosure6.5Important

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