{"id":"CVE-2026-78510","title":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.","summary":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-122"],"vendor":"microsoft","product":"365_apps","affected":["365_apps","microsoft_365","office_2016","office_2019","office_2021","office_2024"],"published":"2026-09-08","updated":"2026-09-25","sourceUpdated":"2026-09-25T22:18:36.710","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78510","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78510","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-09T04:21:18.735957Z"},"epss":0.00373,"epssPercentile":0.31041,"ingestedAt":"2026-09-08T19:08:49.629Z","slug":"CVE-2026-78510","body":"## Overview\n\nHeap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.\n\n## Affected\n\n- `365_apps`\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":46,"depthScoreParts":{"impact":46.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":211194,"id":"CVE-2026-78510","ts":1790374866084,"field":"cvss","old":"9.8","new":"8.4"},{"seq":211193,"id":"CVE-2026-78510","ts":1790374866084,"field":"severity","old":"critical","new":"high"}]}