PT-2026-88013 · Microsoft · 365 Apps+12

CVE-2026-78509

Published

2026-09-08

Updated

2026-09-08

CVSS v3.1

9.8

Critical

Vector

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

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

Fix

RCE

DoS

Heap Based Buffer Overflow

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CVE-2026-78509

365 Apps

365 Apps For Enterprise

Office 2019

Office 365 For Mac

Office Ltsc 2021

Office Ltsc 2024

Office Ltsc For Mac 2021

Office Ltsc For Mac 2024

Office Word

Word 2016

365

Office 2021

Office 2024