{"id":"CVE-2026-20946","aliases":["EUVD-2026-2126","GHSA-q258-f5x3-ccfj"],"status":"published","title":"Microsoft Excel Remote Code Execution Vulnerability","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code 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":0.00654,"percentile":0.51671,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2026-01-13T17:56:46Z","modified":"2026-07-30T20:47:04Z","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":"microsoft office ltsc for mac 2021"},{"vendor":"microsoft","product":"microsoft office ltsc for mac 2024"},{"vendor":"microsoft","product":"office"},{"vendor":"microsoft","product":"office_long_term_servicing_channel"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20946","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20946"},{"url":"https://github.com/advisories/GHSA-q258-f5x3-ccfj"}],"sources":{"cve":[{"id":"CVE-2026-20946","title":"Microsoft Excel Remote Code Execution Vulnerability","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T17:56:46.499Z","modified":"2026-07-30T20:47:04.244Z","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-125"],"updated_at":"2026-11-02T13:35:44.571002Z"}],"euvd":[{"id":"EUVD-2026-2126","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T17:56:46Z","modified":"2026-07-30T20:47:04Z","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":"2026-11-02T18:02:27.233735Z"}],"ghsa":[{"id":"GHSA-q258-f5x3-ccfj","title":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code...","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T18:31:10Z","modified":"2026-01-13T18:31:18Z","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-125"],"updated_at":"2026-11-02T15:05:35.156514Z"}],"nvd":[{"id":"CVE-2026-20946","description":"Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T18:16:22.007Z","modified":"2026-06-17T10:18:05.707Z","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-125"],"updated_at":"2026-11-02T14:12:04.066712Z"}]}}