{"id":"CVE-2026-118721","aliases":["EUVD-2026-122591","GHSA-cmx3-mvw4-c8f8"],"status":"published","title":"Microsoft Office Excel Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Microsoft Office Excel 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":"2026-11-12","score":0.00948,"percentile":0.61658,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-11-10T18:24:59Z","modified":"2026-11-10T21:33:16Z","products":[{"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":"office online server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118721","tags":["vendor-advisory","patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118721"},{"url":"https://github.com/advisories/GHSA-cmx3-mvw4-c8f8"}],"sources":{"cve":[{"id":"CVE-2026-118721","title":"Microsoft Office Excel Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-11-10T18:24:59.99Z","modified":"2026-11-12T21:52:11.957Z","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-122"],"updated_at":"2026-11-10T19:39:58.44836Z"}],"euvd":[{"id":"EUVD-2026-122591","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-11-10T18:24:59Z","modified":"2026-11-12T21:52:11Z","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":"2026-11-10T23:24:34.140893Z"}],"ghsa":[{"id":"GHSA-cmx3-mvw4-c8f8","title":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute...","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-11-10T21:33:08Z","modified":"2026-11-10T21:33:16Z","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-122"],"updated_at":"2026-11-10T21:57:52.876435Z"}],"nvd":[{"id":"CVE-2026-118721","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-11-10T19:19:48.09Z","modified":"2026-11-10T20:18:23.093Z","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-122"],"updated_at":"2026-11-10T22:21:32.984056Z"}]}}