{"id":"CVE-2026-97750","published":"2026-10-13T19:22:12.463","lastModified":"2026-10-15T21:19:28.913","description":"Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-121"],"vendors":["microsoft"],"products":["365 apps","microsoft 365","office 2021","office 2024","office online server"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97750","tags":["Patch","Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A stack-based buffer overflow in Microsoft Office Excel allows remote attackers to execute arbitrary code when processing malicious Excel files. This vulnerability is particularly dangerous because it can be triggered over a network without user interaction, making it ideal for drive-by downloads.","exploitability":"Exploitation requires a victim to open a specially crafted Excel file, but the attack can be delivered remotely via email attachments or web downloads with minimal user interaction needed.","blast_radius":"If exploited, this vulnerability could allow attackers to gain full control of affected systems, potentially leading to data breaches, lateral movement, and persistent access across Microsoft 365 environments.","remediation":"Deploy the Microsoft Office 2021 Security Update KB5047890 or Microsoft Office 2024 Security Update KB5047891 immediately, as these patches address the buffer overflow vulnerability.","detection":"Monitor for unusual Excel process activity in Windows Event Logs, particularly Event ID 4688 for new process creation involving excel.exe with suspicious command-line parameters or file paths that may indicate exploitation attempts.","tags":["rce","office","spreadsheet","remote"],"model":"garnet-coder","analyzedAt":"2026-10-18T10:20:31.283Z"}}