{"id":"CVE-2026-50678","aliases":["EUVD-2026-44038","GHSA-r583-mmgv-j5q5"],"status":"published","title":"Microsoft Excel Information Disclosure Vulnerability","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.","severity":{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00472,"percentile":0.41172,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-07-14T17:05:08Z","modified":"2026-11-01T17:32:46Z","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 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 online server"},{"vendor":"microsoft","product":"office_2019"},{"vendor":"microsoft","product":"office_2021"},{"vendor":"microsoft","product":"office_2024"},{"vendor":"microsoft","product":"office_online_server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50678","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50678"},{"url":"https://github.com/advisories/GHSA-r583-mmgv-j5q5"}],"sources":{"cve":[{"id":"CVE-2026-50678","title":"Microsoft Excel Information Disclosure Vulnerability","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.","status":"published","published":"2026-07-14T17:05:08.873Z","modified":"2026-11-01T17:32:46.27Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:20:09.098623Z"}],"euvd":[{"id":"EUVD-2026-44038","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.","status":"published","published":"2026-07-14T17:05:08Z","modified":"2026-11-01T17:32:46Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T16:58:49.161713Z"}],"ghsa":[{"id":"GHSA-r583-mmgv-j5q5","title":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose...","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.","status":"published","published":"2026-07-14T18:32:06Z","modified":"2026-07-14T18:32:11Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H","level":"medium"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:09:28.885137Z"}],"nvd":[{"id":"CVE-2026-50678","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.","status":"published","published":"2026-07-14T17:17:02.187Z","modified":"2026-07-15T18:30:06.66Z","cvss":[{"version":"3.1","score":6.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}