CVE-2026-88156: Microsoft Office Outlook Remote Code Execution Vulnerability
Microsoft Office Outlook Remote Code Execution Vulnerability
Other sources
Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.21056 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20974 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in https://aka.ms/OfficeSecurityReleases
Event History
Frequently Asked Questions
Which Office product families should be prioritized for review?
The affected software list includes Microsoft 365 Apps for Enterprise; Microsoft Office LTSC 2024 for 32-bit and 64-bit editions; Microsoft Office LTSC 2021 for 32-bit and 64-bit editions; Microsoft Office 365 for Mac; and Microsoft Office LTSC for Mac 2021 and 2024.
Does exploitation require authentication, prior privileges, or user interaction?
No. The CVSS vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction required.
What is the expected security impact if exploitation succeeds?
The CVSS assessment assigns high impact to confidentiality, integrity, and availability. This means successful exploitation could expose data, alter data or system behavior, and disrupt affected systems.