{"id":"CVE-2026-63513","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-63513","generatedAt":"2026-10-27T23:08:32.027Z","title":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.","description":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.","published":"2026-08-11T17:18:46.000Z","lastModified":"2026-08-14T15:29:35.000Z","status":"Analyzed","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":["CWE-122"],"affected":["microsoft/365 apps","microsoft/microsoft 365","microsoft/office 2016","microsoft/office 2019","microsoft/office 2021","microsoft/office 2024"],"epss":{"score":0.00466,"percentile":0.40129,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63513","tags":["Vendor Advisory"],"source":"secure@microsoft.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63513","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}