{"id":"CVE-2026-97746","published":"2026-10-13T19:22:11.953","lastModified":"2026-10-15T21:19:28.490","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-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-2026-97746","tags":["Patch","Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A Microsoft Excel integer underflow vulnerability allows remote attackers to execute arbitrary code when processing specially crafted Excel files. This flaw can be triggered over a network without user interaction, making it particularly dangerous for enterprise environments.","exploitability":"Exploitation is moderately difficult as it requires crafting a malicious Excel file with specific integer underflow conditions, but the attack can be delivered remotely without user interaction once the file is accessed.","blast_radius":"The vulnerability affects all Microsoft 365 apps and Office versions including 2021 and 2024, potentially impacting thousands of endpoints across an organization when users open malicious Excel files.","remediation":"Deploy Microsoft Security Update KB5047890 or later to all affected Office installations.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","excel","remote"],"model":"garnet-coder","analyzedAt":"2026-10-18T10:20:14.984Z"}}