CVE-2026-70256: Microsoft Office Outlook Remote Code Execution Vulnerability
Published Oct 13, 2026
·Updated
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
6 affected componentsFixes available
Microsoft 365 Apps
Microsoft 365 Apps
Microsoft Office 2024
Microsoft Office 2024
Microsoft Office LTSC 2024<16.0.17932.21056
16.0.17932.21056
Microsoft Office LTSC 2024<16.0.17932.21056
16.0.17932.21056
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
Event History
Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:00 PM
Data Sourced
via MITRE·07:00 PM
DescriptionSeverity
Data Sourced
via NVD·07:19 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
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.
2
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.
3
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.