CVE-2026-70256: Microsoft Office Outlook Remote Code Execution Vulnerability
Overview
- Severity
- High (CVSS 8.8)
- CVSS Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Category
- Remote Code Execution
- Exploit Status
- Not Exploited
- Exploitation Likelihood
- Less Likely
- Patch Tuesday
- 2026-Oct
- Released
- 2026-10-13
Description
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
FAQ
According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). What is the target context of the remote code execution?
This attack requires a user to open a specially crafted file from the attacker to initiate remote code execution.
Affected Products (4)
Microsoft Office
- Microsoft Office LTSC 2024 for 64-bit editions
- Microsoft Office LTSC 2024 for 32-bit editions
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft 365 Apps for Enterprise for 32-bit Systems
Acknowledgments
0ccbbf129444eb66344ccafb92b00df4
Revision History
- 2026-10-13: Information published.