Microsoft disclosed CVE-2026-62870, a use-after-free vulnerability in Excel rated CVSS 8.8 that allows remote code execution over a network. The flaw affects multiple supported versions of Microsoft 365 Apps, Excel 2016, Office 2019, and LTSC editions and was published August 3, 2026.
Affected products span multiple versions of Microsoft Office and Excel.
The description states that the use-after-free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Enterprise security teams should prioritize the Office security release referenced in the advisory to close network-attack paths on affected Excel deployments.
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