{"id":"CVE-2026-97777","published":"2026-10-13T19:22:15.710","lastModified":"2026-10-15T21:19:32.050","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-2026-97777","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 over a network. This vulnerability could enable attackers to gain full control of affected systems.","exploitability":"Exploitation requires a user to open a specially crafted Excel file, making it moderately difficult but achievable through social engineering or phishing campaigns.","blast_radius":"If exploited, this vulnerability could affect thousands of users across Microsoft 365 and Office applications, potentially leading to widespread system compromise and data exfiltration.","remediation":"Deploy the Microsoft Office 2021 version 2408 or later, or Microsoft Office 2024 version 2408 or later, as these versions contain the necessary security fixes for this 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":"2026-10-18T10:22:40.738Z"}}