CVE-2026-55899

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CVSS 3.1

7.8 high

EPSS

<1%p39

Published

Jul 14, 2026 (Jul 14, 2026)

Modified

Jul 16, 2026

Description

Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Vendors: microsoft
Products: 365 apps, excel, microsoft 365, office 2019, office 2021, office 2024, office online server
Weakness: CWE-20, CWE-121
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.5%)

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