{"id":"CVE-2026-78510","title":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network.","summary":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/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":"2026-09-21","sourceUpdated":"2026-09-21T17:18:57.837","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"],"epss":0.00954,"epssPercentile":0.59303,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-09T04:21:18.735957Z"},"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 over a network.\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":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}