cve 2026 65807

CVE-2026-65807 is a Microsoft Excel remote code execution vulnerability addressed in the August 11, 2026 Office security release. The fix is delivered through Office update channels, including Current Channel, Monthly Enterprise Channel, and Semi-Annual Enterprise Channel, rather than as a Windows cumulative update. IT administrators should confirm that managed Microsoft 365 Apps and supported perpetual Office installations have received the August build. Microsoft's Security Update Guide and Microsoft Learn release notes identify the flaw under Excel for this date. The tag covers the vulnerability details, affected Office products, and the practical steps for applying the patch in enterprise environments.