CVE-2026-81949 – Microsoft Excel Remote Code Execution Vulnerability
CVSS 7.8
IMPORTANT
Critical - Same Day Deployment
“A malicious Excel file could turn a routine document open into code execution with high impact to data and systems.”
CVE-2026-81949 is a critical remote code execution vulnerability caused by an integer overflow or wraparound in Microsoft Office Excel. An unauthorized attacker can send a specially crafted Office file and convince a user to open it, potentially resulting in code execution. Exploitation requires no privileges but does require user interaction. The Preview Pane is not an attack vector.
Key Details
- Affected Product
- Microsoft 365 Apps
- Attack Vector
- Local
- Attack Complexity
- Low
- Privileges Required
- None
- User Interaction
- Required
- CWE Classification
- CWE-190
Patch this CVE on all your endpoints in under 5 minutes.
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