{"id":"CVE-2026-100211","published":"2026-10-13T19:17:41.073","lastModified":"2026-10-15T21:16:48.113","description":"Use after free 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-416"],"vendors":["microsoft"],"products":["365 apps","microsoft 365","office 2021","office 2024"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-100211","tags":["Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A use-after-free vulnerability in Microsoft Excel allows remote attackers to execute arbitrary code when a malicious file is opened. This occurs when Excel improperly handles memory after an object has been freed, creating a potential remote code execution vector.","exploitability":"Exploitation requires a user to open a specially crafted Excel file, making it moderately difficult but possible to achieve remote code execution with social engineering.","blast_radius":"The vulnerability affects Microsoft 365 apps and Office 2021/2024, meaning a wide range of users could be impacted, potentially leading to widespread remote code execution across enterprise networks.","remediation":"Deploy the Microsoft Office 2021 or Office 2024 update that includes the fix for CVE-2026-100211, specifically version 2403 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","excel","memory-corruption","remote"],"model":"garnet-coder","analyzedAt":"2026-10-17T08:51:24.932Z"}}