KB5002904: what it fixes and who gets it
KB5002904 is a security update from Microsoft's September 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 KB5002904
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-81948Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Critical |
| CVE-2026-81949Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Critical |
| CVE-2026-81950Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Critical |
| CVE-2026-81951Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Critical |
| CVE-2026-81953Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Critical |
| CVE-2026-81959Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Critical |
| CVE-2026-78518Microsoft Office Excel Remote Code Execution Vulnerability | Remote Code Execution | 8.8 | Important |
| CVE-2026-81386Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81388Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81396Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81397Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81398Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81947Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81954Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81956Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81957Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81960Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-81389Microsoft Excel Remote Code Execution Vulnerability | Remote Code Execution | 7.0 | Important |
| CVE-2026-81387Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81390Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81391Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81392Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81393Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81394Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81395Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81399Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81400Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81401Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-81958Microsoft Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
| CVE-2026-85875Microsoft Office Excel Information Disclosure Vulnerability | Information Disclosure | 5.5 | Important |
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