CVE-2026-70257: 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 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 Outlook product editions are listed as affected?
The listed products are Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021 for 32-bit and 64-bit editions, and Microsoft Office LTSC 2024 for 32-bit and 64-bit editions.
Does exploitation require an authenticated account or user interaction?
The vector indicates no attacker privileges are required, but user interaction is required. The attack vector is network-based and has low attack complexity.
What could successful exploitation allow?
Successful exploitation could allow code execution and is rated as having high impact on confidentiality, integrity, and availability.