{"id":"CVE-2026-55020","title":"Microsoft SharePoint Server Spoofing Vulnerability","summary":"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":"medium","cvss":4.6,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-79"],"vendor":"Microsoft","product":"Microsoft SharePoint Enterprise Server 2016","affected":["sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001","sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175","sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-16T14:01:45.579357Z"},"published":"2026-07-14","updated":"2026-09-17","sourceUpdated":"2026-09-17T22:32:33.788Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55020","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55020","label":"Microsoft SharePoint Server Spoofing Vulnerability"}],"tags":["cve.org"],"epss":0.00583,"epssPercentile":0.46301,"ingestedAt":"2026-09-08T17:06:31.910Z","slug":"CVE-2026-55020","body":"## Overview\n\nImproper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.\n\n## Affected\n\n- `sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001`\n- `sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175`\n- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":25,"depthScoreParts":{"impact":25.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}