{"id":"CVE-2025-53771","aliases":[],"url":"https://o3.security/vulnerability/CVE-2025-53771","summary":"Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.","details":"Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.","published":"2025-07-20T23:15:31.807","modified":"2026-06-17T09:38:51.820","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":{"score":0.99735,"percentile":0.99953,"asOf":"2026-09-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53771"},{"type":"WEB","url":"https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-06-17T09:38:51.820"}}