{"id":"CVE-2026-21259","aliases":["EUVD-2026-7355","GHSA-pw6x-8hxj-hv8c"],"status":"published","title":"Microsoft Excel Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/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":"2026-11-10","score":0.00551,"percentile":0.46409,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122","CWE-787"],"published":"2026-02-10T17:51:17Z","modified":"2026-08-19T16:25:49Z","products":[{"vendor":"microsoft","product":"365_apps"},{"vendor":"microsoft","product":"excel"},{"vendor":"microsoft","product":"microsoft 365 apps for enterprise"},{"vendor":"microsoft","product":"microsoft excel 2016"},{"vendor":"microsoft","product":"microsoft office 2019"},{"vendor":"microsoft","product":"microsoft office ltsc 2021"},{"vendor":"microsoft","product":"microsoft office ltsc 2024"},{"vendor":"microsoft","product":"office"},{"vendor":"microsoft","product":"office online server"},{"vendor":"microsoft","product":"office_long_term_servicing_channel"},{"vendor":"microsoft","product":"office_online_server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21259","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21259"},{"url":"https://github.com/advisories/GHSA-pw6x-8hxj-hv8c"}],"sources":{"cve":[{"id":"CVE-2026-21259","title":"Microsoft Excel Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.","status":"published","published":"2026-02-10T17:51:17.445Z","modified":"2026-08-19T16:25:49.87Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/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":"2026-11-02T13:41:53.237769Z"}],"euvd":[{"id":"EUVD-2026-7355","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.","status":"published","published":"2026-02-10T17:51:17Z","modified":"2026-08-19T16:25:49Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T18:01:44.550802Z"}],"ghsa":[{"id":"GHSA-pw6x-8hxj-hv8c","title":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate...","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.","status":"published","published":"2026-02-10T18:30:41Z","modified":"2026-02-11T21:30:38Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-122","CWE-787"],"updated_at":"2026-11-02T15:06:09.03825Z"}],"nvd":[{"id":"CVE-2026-21259","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.","status":"published","published":"2026-02-10T18:16:27.79Z","modified":"2026-06-17T10:18:22.883Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-122","CWE-787"],"updated_at":"2026-11-02T14:12:05.52517Z"}]}}