{"id":"CVE-2026-20959","aliases":["EUVD-2026-2101","GHSA-wvw4-rf55-ww3f"],"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":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.07681,"percentile":0.94641,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-01-13T17:56:49Z","modified":"2026-07-30T20:47:07Z","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-2026-20959","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20959"},{"url":"https://github.com/advisories/GHSA-wvw4-rf55-ww3f"}],"sources":{"cve":[{"id":"CVE-2026-20959","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":"2026-01-13T17:56:49.22Z","modified":"2026-07-30T20:47:07.974Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:35:44.571002Z"}],"euvd":[{"id":"EUVD-2026-2101","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":"2026-01-13T17:56:49Z","modified":"2026-07-30T20:47:07Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T18:02:27.233735Z"}],"ghsa":[{"id":"GHSA-wvw4-rf55-ww3f","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":"2026-01-13T18:31:11Z","modified":"2026-01-13T18:31:19Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:05:35.156514Z"}],"nvd":[{"id":"CVE-2026-20959","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":"2026-01-13T18:16:23.937Z","modified":"2026-06-17T10:18:07.103Z","cvss":[{"version":"3.1","score":4.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:04.066712Z"}]}}