CVE-2026-70256: Microsoft Office Outlook Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft Office Outlook Remote Code Execution Vulnerability
— 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 https://aka.ms/OfficeSecurityReleases
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
The vulnerability is rated as requiring no privileges and having low attack complexity. Exploitation does require user interaction.
What is the potential impact if exploitation succeeds?
Successful exploitation could allow code execution and is rated with high impact to confidentiality, integrity, and availability.
Which Outlook deployments are identified as affected?
The listed affected software includes Microsoft 365 Apps for Enterprise and Microsoft Office LTSC 2024 in both 32-bit and 64-bit editions.