CVE-2026-81951 – Microsoft Excel Remote Code Execution Vulnerability
CVSS 7.8
IMPORTANT
Critical - Same Day Deployment
“A malicious Excel file can turn a routine document open into code execution, putting sensitive data and system integrity at risk.”
CVE-2026-81951 is a heap-based buffer overflow vulnerability in Microsoft Excel that can allow an unauthorized attacker to execute code locally. Exploitation requires a malicious Office file to be sent to a user and convincing that user to open it. No privileges are required, but user interaction is required. 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-122
Patch this CVE on all your endpoints in under 5 minutes.
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