{"id":"CVE-2026-20956","aliases":["EUVD-2026-2104","GHSA-v6cw-63j5-79wf"],"status":"published","title":"Microsoft Excel Remote Code Execution Vulnerability","description":"Untrusted pointer dereference 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":0.00449,"percentile":0.39352,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-822"],"published":"2026-01-13T17:56:48Z","modified":"2026-07-30T20:47:06Z","products":[{"vendor":"microsoft","product":"365_apps"},{"vendor":"microsoft","product":"microsoft 365 apps for enterprise"},{"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_long_term_servicing_channel"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20956","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20956"},{"url":"https://github.com/advisories/GHSA-v6cw-63j5-79wf"}],"sources":{"cve":[{"id":"CVE-2026-20956","title":"Microsoft Excel Remote Code Execution Vulnerability","description":"Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T17:56:48.553Z","modified":"2026-07-30T20:47:06.84Z","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-822"],"updated_at":"2026-11-02T13:35:33.380441Z"}],"euvd":[{"id":"EUVD-2026-2104","description":"Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T17:56:48Z","modified":"2026-07-30T20:47:06Z","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-v6cw-63j5-79wf","title":"Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to...","description":"Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T18:31:11Z","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-822"],"updated_at":"2026-11-02T15:05:35.156514Z"}],"nvd":[{"id":"CVE-2026-20956","description":"Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.","status":"published","published":"2026-01-13T18:16:23.467Z","modified":"2026-06-17T10:18:06.757Z","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-822"],"updated_at":"2026-11-02T14:12:04.066712Z"}]}}