{"id":"CVE-2026-97769","published":"2026-10-13T19:22:14.740","lastModified":"2026-10-15T21:19:31.103","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-20","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-2026-97769","tags":["Patch","Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A heap-based buffer overflow in Microsoft Office Excel allows remote code execution when processing malicious files over a network, potentially enabling attackers to run arbitrary code on affected systems.","exploitability":"Exploitation requires user interaction via opening a malicious Excel file over a network share or via email attachment, making it moderately difficult but achievable with social engineering.","blast_radius":"If exploited, this vulnerability could impact millions of users running Office 2021, Office 2024, Office Online Server, and Microsoft 365 apps, potentially leading to full system compromise and lateral movement across networks.","remediation":"Deploy the Microsoft Security Update KB5049879 immediately to all affected systems running Office 2021, Office 2024, or Office Online Server.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","excel","network"],"model":"garnet-coder","analyzedAt":"2026-10-18T10:22:03.427Z"}}