CVE-2026-40420

—

CVSS 3.1

8.8 high

EPSS

<1%p11

Published

May 12, 2026 (May 12, 2026)

Modified

Jun 17, 2026

Description

Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.

Vendors: microsoft
Products: 365 apps, office, office long term servicing channel
Weakness: CWE-284
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.2%)

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