CVE-2026-88156

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

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - secure@microsoft.com

Published

2026-10-13

Last modified

2026-10-28

Weaknesses

CWE-121

Affected products

• 365 Apps (Microsoft)
• Microsoft 365 (Microsoft)
• Office 2021 (Microsoft)
• Office 2024 (Microsoft)
• Office 365 (Microsoft)
• Office Macos 2021 (Microsoft)
• Office Macos 2024 (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88156