{"id":"CVE-2026-97773","published":"2026-10-13T19:22:15.227","lastModified":"2026-10-15T21:19:31.620","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-2026-97773","tags":["Patch","Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A heap-based buffer overflow in Microsoft Excel allows remote attackers to execute arbitrary code when processing malicious Excel files. This vulnerability affects multiple Microsoft 365 and Office versions, making it a significant risk for enterprise environments.","exploitability":"Exploitation requires user interaction via a malicious Excel file delivered over the network, with no preconditions for successful exploitation once the file is opened.","blast_radius":"If exploited, this vulnerability could allow attackers to gain full control of affected systems through Excel's auto-execution capabilities, potentially leading to widespread compromise across an organization.","remediation":"Deploy Microsoft Security Update MS26-078 for Office 2021, Office 2024, and Microsoft 365 apps, which addresses this heap-based buffer overflow vulnerability.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","excel","remote-exploit","buffer-overflow"],"model":"garnet-coder","analyzedAt":"2026-10-18T10:22:25.568Z"}}