Designated as CVE 2025 53771 and CVE 2025 53770 , the two vulnerabilities apply only to on premises versions of SharePoint, so organizations that run the cloud based SharePoint Online are unaffected. Also: How to upgrade an 'incompatible' Windows 10 PC to Windows 11 2 free options Rated as important, CVE 2025 53771 is defined as a SharePoint Server spoofing vulnerability, which means that attackers are able to impersonate trusted and legitimate users or resources in a SharePoint en
