CVE-2026-77902

No fix known EPSS <1%CVSS 8.8

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Published 2026-10-13 · CVE record · OSV

Products: Microsoft 365 Apps for Enterprise, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024