KB5002878: what it fixes and who gets it
KB5002878 is a security update from Microsoft's June 2026 release for Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition).
Microsoft data read
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 KB5002878
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-45461Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | 8.4 | Critical |
| CVE-2026-45463Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | 8.4 | Critical |
| CVE-2026-45472Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | 8.4 | Critical |
| CVE-2026-45474Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | 8.4 | Critical |
| CVE-2026-44819Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-44824Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-45475Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-44821Microsoft Office Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-45485Microsoft Office Information Disclosure Vulnerability | Information Disclosure | 3.3 | Important |
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