CVE-2026-78517

high Microsoft
CVSS v3 Base Score
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Published: September 8, 2026 (2 days ago)
Last Modified: September 9, 2026
Vendor: Microsoft
Source: MITRE

Description

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

CWE

CWE-122

Affected Products

Microsoft Microsoft 365 Apps for EnterpriseMicrosoft Microsoft Office 2019Microsoft Microsoft Office 365 for MacMicrosoft Microsoft Office LTSC 2021Microsoft Microsoft Office LTSC 2024Microsoft Microsoft Office LTSC for Mac 2021Microsoft Microsoft Office LTSC for Mac 2024Microsoft Microsoft Word 2016

References

🔗 msrc.microsoft.com