{"id":"CVE-2026-97757","published":"2026-10-13T19:22:13.367","lastModified":"2026-10-15T21:19:29.770","description":"Heap-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-122"],"vendors":["microsoft"],"products":["365 apps","microsoft 365","office 2021","office 2024","office online server"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97757","tags":["Patch","Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A heap-based buffer overflow in Microsoft Office Excel allows remote attackers to execute arbitrary code when processing malicious Excel files over a network. This vulnerability could enable attackers to gain full control of affected systems.","exploitability":"Exploitation requires a user to open a malicious Excel file, making it moderately difficult but achievable through social engineering or phishing campaigns with minimal preconditions.","blast_radius":"If exploited, this vulnerability could impact millions of users running Microsoft 365 apps, Office 2021, and Office 2024, potentially leading to widespread remote code execution across enterprise networks.","remediation":"Deploy the Microsoft Security Update KB5045789 for Excel 2021 and Office 2024, or upgrade to Microsoft 365 Apps for enterprise version 2408 or later.","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 access patterns that indicate processing of external files.","tags":["rce","excel","office","remote"],"model":"garnet-coder","analyzedAt":"2026-10-18T10:21:10.106Z"}}