{"id":"CVE-2026-81397","title":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","summary":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-122"],"vendor":"microsoft","product":"365_apps","affected":["365_apps","excel = 2016","microsoft_365","office_2016","office_2019","office_2021","office_2024"],"published":"2026-09-08","updated":"2026-09-17","sourceUpdated":"2026-09-17T20:18:39.400","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81397","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81397","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-09T04:19:44.392681Z"},"epss":0.00418,"epssPercentile":0.35681,"ingestedAt":"2026-09-08T19:08:49.632Z","slug":"CVE-2026-81397","body":"## Overview\n\nHeap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.\n\n## Affected\n\n- `365_apps`\n- `excel = 2016`\n- `microsoft_365`\n- `office_2016`\n- `office_2019`\n- `office_2021`\n- `office_2024`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}