Pierluigi Paganini
October 24, 2025
China-based threat actors exploited ToolShell SharePoint flaw CVE-2025-53770 soon after its July patch. China-linked threat actors exploited the ToolShell SharePoint flaw vulnerability, tracked as CVE-2025-53770, to breach a telecommunications company in the Middle East after it was addressed by Microsoft in July 2025. “China-based attackers used the ToolShell vulnerability (CVE-2025-53770) to compromise a telecoms company in […]
Pierluigi Paganini
July 21, 2025
Microsoft patched an exploited SharePoint flaw (CVE-2025-53770) and disclosed a new one, warning of ongoing attacks on on-prem servers. Microsoft released emergency SharePoint updates for two zero-day flaws, tracked as CVE-2025-53770 and CVE-2025-53771, exploited since July 18 in attacks dubbed “ToolShell.” Both vulnerabilities only impact on-premises SharePoint Servers, threat actors could chain them for unauthenticated, […]
Pierluigi Paganini
July 21, 2025
Microsoft warns of ongoing active exploitation of a SharePoint zero-day vulnerability, tracked as CVE-2025-53770. Microsoft warns of a SharePoint zero-day vulnerability, tracked as CVE-2025-53770 (CVSS score of 9.8), which is under active exploitation. Unfortunately, the flaw has yet to be addressed. The vulnerability is a deserialization of untrusted data in on-premises Microsoft SharePoint Server, an […]
