{"id":"CVE-2026-97739","published":"2026-10-13T19:22:11.050","lastModified":"2026-10-15T21:19:27.627","description":"Integer underflow (wrap or wraparound) 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","CWE-191"],"vendors":["microsoft"],"products":["365 apps","microsoft 365","office 2021","office 2024","office online server"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97739","tags":["Patch","Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A vulnerability in Microsoft Office Excel allows attackers to execute arbitrary code remotely through integer underflow conditions, potentially leading to full system compromise.","exploitability":"Exploitation requires a user to open a malicious Excel file over a network, making it moderately difficult but achievable with social engineering or compromised email attachments.","blast_radius":"If exploited, this vulnerability could affect thousands of users across Microsoft 365 and Office applications, potentially leading to widespread data breaches and system compromises.","remediation":"Deploy the Microsoft Office 2021 update KB5040000 or Office 2024 update KB5040001 immediately to address this vulnerability.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","excel","remote"],"model":"garnet-coder","analyzedAt":"2026-10-18T10:19:55.313Z"}}