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KB5002879: what it fixes and who gets it

KB5002879 is a security update from Microsoft's June 2026 release for Microsoft Word 2016 (32-bit edition), Microsoft Word 2016 (64-bit edition).

Microsoft data read
3CVEs fixed
2rated 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 KB5002879

CVETypeCVSSSeverity
CVE-2026-45456Microsoft Outlook and Word Remote Code Execution VulnerabilityRemote Code Execution8.4Critical
CVE-2026-45458Microsoft Outlook and Word Remote Code Execution VulnerabilityRemote Code Execution8.4Critical
CVE-2026-45471Microsoft Word Remote Code Execution VulnerabilityRemote Code Execution7.8Important

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