Microsoft · Security update · September 8, 2026
KB5002910: September 2026 security update
KB5002910, released September 8, 2026, fixes 5 CVEs in Office Online Server. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
5
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0054
45th percentile
Priority of the 5 CVEs
Patch now 0
Urgent 0
High 3
Routine 2
Applies to
| Product |
|---|
| Office Online Server |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2026-81396 | Microsoft Office Excel | Remote Code Execution | 7.8 | 0.0047 | Exploitation Unlikely |
| High | CVE-2026-81947 | Microsoft Office Excel | Remote Code Execution | 7.8 | 0.0047 | Exploitation Less Likely |
| High | CVE-2026-81956 | Microsoft Office Excel | Remote Code Execution | 7.8 | 0.0047 | Exploitation Less Likely |
| Routine | CVE-2026-81390 | Microsoft Office Excel | Information Disclosure | 5.5 | 0.0054 | Exploitation Less Likely |
| Routine | CVE-2026-81401 | Microsoft Office Excel | Information Disclosure | 5.5 | 0.0054 | Exploitation Less Likely |
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