CVE-2026-68798: Microsoft Excel Remote Code Execution Vulnerability Acknowledged

Microsoft has formally acknowledged a remote code execution vulnerability in Excel identified as CVE-2026-68798. The flaw can be triggered by opening a specially crafted workbook, potentially allowing an attacker to run arbitrary code on the victim’s machine.

Impact

Adversaries could gain full control of affected systems, exfiltrate data, or deploy additional malware. The vulnerability is exploitable in both online and offline contexts, meaning any user who opens a malicious file is at risk.

Mitigation Steps

• Apply the upcoming security update as soon as it is released.
• Disable or restrict macro execution in Excel (File → Options → Trust Center).
• Enforce application whitelisting and least privilege for Office applications.
• Educate users to avoid opening unknown or suspicious spreadsheets.

Monitoring

Use endpoint detection and response (EDR) to flag anomalous process creation from Excel and monitor for known exploitation patterns.