Microsoft · Security update · September 8, 2026

KB5002904: September 2026 security update

KB5002904, released September 8, 2026, fixes 30 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent
CVEs closed
30
6 rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0086
58th percentile

Priority of the 30 CVEs

Patch now 0 Urgent 6 High 12 Routine 12

Applies to

Product
Microsoft Office 2016 (32-bit edition)
Microsoft Office 2016 (64-bit edition)

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Urgent CVE-2026-81948 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
Urgent CVE-2026-81949 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Unlikely
Urgent CVE-2026-81950 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
Urgent CVE-2026-81951 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
Urgent CVE-2026-81953 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
Urgent CVE-2026-81959 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
High CVE-2026-78518 Microsoft Office Excel Remote Code Execution 8.8 0.0086 Exploitation Less Likely
High CVE-2026-81386 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
High CVE-2026-81388 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Unlikely
High CVE-2026-81396 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Unlikely
High CVE-2026-81397 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
High CVE-2026-81398 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
High CVE-2026-81947 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
High CVE-2026-81954 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
High CVE-2026-81957 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
High CVE-2026-81960 Microsoft Office Excel Remote Code Execution 7.8 0.0047 Exploitation Less Likely
High CVE-2026-81389 Microsoft Office Excel Remote Code Execution 7.0 0.0037 Exploitation Less Likely
Routine CVE-2026-81387 Microsoft Office Excel Information Disclosure 5.5 0.0055 Exploitation Less Likely
Routine CVE-2026-81394 Microsoft Office Excel Information Disclosure 5.5 0.0055 Exploitation Less Likely
Routine CVE-2026-81390 Microsoft Office Excel Information Disclosure 5.5 0.0054 Exploitation Less Likely
Routine CVE-2026-81391 Microsoft Office Excel Information Disclosure 5.5 0.0054 Exploitation Less Likely
Routine CVE-2026-81392 Microsoft Office Excel Information Disclosure 5.5 0.0054 Exploitation Less Likely
Routine CVE-2026-81393 Microsoft Office Excel Information Disclosure 5.5 0.0054 Exploitation Less Likely
Routine CVE-2026-81395 Microsoft Office Excel Information Disclosure 5.5 0.0054 Exploitation Unlikely
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