{"id":"CVE-2026-83891","published":"2026-10-13T19:20:40.100","lastModified":"2026-10-15T21:18:32.537","description":"Stack-based buffer overflow in Microsoft Office Word 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-20","CWE-121"],"vendors":["microsoft"],"products":["365 apps","microsoft 365","office 2021","office 2024"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83891","tags":["Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A stack-based buffer overflow in Microsoft Word allows remote attackers to execute arbitrary code when processing maliciously crafted documents over a network. This vulnerability could enable attackers to gain full control of affected systems without requiring user interaction.","exploitability":"Exploitation is moderately difficult as it requires crafting a malicious Word document and tricking users into opening it, but the attack surface is large since Office is widely used in enterprise environments.","blast_radius":"The vulnerability could impact thousands of endpoints across an organization, potentially leading to full system compromise and lateral movement throughout the network.","remediation":"Deploy Microsoft Security Update KB5042813 immediately to all affected systems running Office 2021 or Office 2024.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","office","remote-exploitation","buffer-overflow"],"model":"garnet-coder","analyzedAt":"2026-10-18T09:59:44.998Z"}}