CVE-2026-55039

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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

Integer underflow (wrap or wraparound) 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-122, CWE-191
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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