{"id":"CVE-2026-55021","aliases":["EUVD-2026-44166","GHSA-c9qw-72v3-rp2r"],"status":"published","title":"Microsoft SharePoint Server Spoofing Vulnerability","description":"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00946,"percentile":0.61553,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-07-14T17:08:35Z","modified":"2026-11-10T22:39:05Z","products":[{"vendor":"microsoft","product":"microsoft sharepoint enterprise server 2016"},{"vendor":"microsoft","product":"microsoft sharepoint server 2019"},{"vendor":"microsoft","product":"microsoft sharepoint server subscription edition"},{"vendor":"microsoft","product":"sharepoint_server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55021","tags":["vendor-advisory","patch","Vendor Advisory","Patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55021"},{"url":"https://github.com/advisories/GHSA-c9qw-72v3-rp2r"}],"sources":{"cve":[{"id":"CVE-2026-55021","title":"Microsoft SharePoint Server Spoofing Vulnerability","description":"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-07-14T17:08:35.528Z","modified":"2026-11-10T22:39:05.301Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-10T23:49:29.755102Z"}],"euvd":[{"id":"EUVD-2026-44166","description":"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-07-14T17:08:35Z","modified":"2026-11-10T22:39:05Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-11T00:24:47.486736Z"}],"ghsa":[{"id":"GHSA-c9qw-72v3-rp2r","title":"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft...","description":"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-07-14T18:32:32Z","modified":"2026-07-14T18:32:37Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:09:30.119193Z"}],"nvd":[{"id":"CVE-2026-55021","description":"Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-07-14T18:18:12.663Z","modified":"2026-07-15T15:13:09.663Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}