{"id":"CVE-2026-83891","aliases":["EUVD-2026-99721","GHSA-cw5m-j449-89h4"],"status":"published","title":"Microsoft Office Word Remote Code Execution Vulnerability","description":"Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00901,"percentile":0.60117,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121","CWE-20"],"published":"2026-10-13T19:00:29Z","modified":"2026-11-10T20:40:01Z","products":[{"vendor":"microsoft","product":"365_apps"},{"vendor":"microsoft","product":"microsoft 365 apps for enterprise"},{"vendor":"microsoft","product":"microsoft office 365 for mac"},{"vendor":"microsoft","product":"microsoft office ltsc 2021"},{"vendor":"microsoft","product":"microsoft office ltsc 2024"},{"vendor":"microsoft","product":"microsoft office ltsc for mac 2021"},{"vendor":"microsoft","product":"microsoft office ltsc for mac 2024"},{"vendor":"microsoft","product":"microsoft_365"},{"vendor":"microsoft","product":"office_2021"},{"vendor":"microsoft","product":"office_2024"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83891","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83891"},{"url":"https://github.com/advisories/GHSA-cw5m-j449-89h4"}],"sources":{"cve":[{"id":"CVE-2026-83891","title":"Microsoft Office Word Remote Code Execution Vulnerability","description":"Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T19:00:29.387Z","modified":"2026-11-10T20:40:01.115Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-121","CWE-20"],"updated_at":"2026-11-10T22:18:28.707469Z"}],"euvd":[{"id":"EUVD-2026-99721","description":"Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T19:00:29Z","modified":"2026-11-10T20:40:01Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:59.037992Z"}],"ghsa":[{"id":"GHSA-cw5m-j449-89h4","title":"Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute...","description":"Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T21:35:05Z","modified":"2026-10-13T21:35:06Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:13:17.40783Z"}],"nvd":[{"id":"CVE-2026-83891","description":"Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T19:20:40.1Z","modified":"2026-10-15T21:18:32.537Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-20","CWE-121"],"updated_at":"2026-11-02T14:12:58.13117Z"}]}}