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CVE-2026-26109
HIGH
CVSS: 8.4
Published: 2026-03-10
Modified: 2026-06-17
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected Platforms
Microsoft 365 AppsMicrosoft Office Online ServerMicrosoft Office Long Term Servicing ChannelMicrosoft ExcelMicrosoft Office