PT-2026-48009 · Microsoft · 365 Apps For Enterprise+7

Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-45645

NVD

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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

Fix

Untrusted Pointer Dereference

Weakness Enumeration

CWE-822

Related Identifiers

CVE-2026-45645

Affected Products

365 Apps For Enterprise

Office 2016

Office 2019

Office 365 For Mac

Office Ltsc 2021

Office Ltsc 2024

Office Ltsc For Mac 2021

Office Ltsc For Mac 2024

References · 2

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45645 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-45645 · Security Note