Microsoft · Security update · June 9, 2026

KB5002877: June 2026 security update

KB5002877, released June 9, 2026, fixes 7 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: High.

High
CVEs closed
7
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0063
50th percentile

Priority of the 7 CVEs

Patch now 0 Urgent 0 High 6 Routine 1

Applies to

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

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
High CVE-2026-44822 Microsoft Office Excel Information Disclosure 8.2 0.0052 Exploitation Unlikely
High CVE-2026-44817 Microsoft Office Excel Remote Code Execution 7.8 0.0037 Exploitation Unlikely
High CVE-2026-44820 Microsoft Office Excel Remote Code Execution 7.8 0.0037 Exploitation Less Likely
High CVE-2026-44823 Microsoft Office Excel Remote Code Execution 7.8 0.0037 Exploitation Less Likely
High CVE-2026-45469 Microsoft Office Excel Remote Code Execution 7.8 0.0037 Exploitation Less Likely
High CVE-2026-44818 Microsoft Office Excel Remote Code Execution 7.0 0.0026 Exploitation Less Likely
Routine CVE-2026-45455 Microsoft Office Excel Information Disclosure 3.3 0.0063 Exploitation Less Likely
Showing 1 to 7 of 7 1