KB5002877: what it fixes and who gets it
KB5002877 is a security update from Microsoft's June 2026 release for Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition).
Microsoft data read
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 KB5002877
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-44822Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 8.2 | Important |
| CVE-2026-44817Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-44820Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-44823Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-45469Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-44818Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.0 | Important |
| CVE-2026-45455Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 3.3 | Important |
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