Microsoft links Sharepoint attacks to Chinese hacking groups

Several hacking groups with ties to the Chinese government have been linked to a recent wave of widespread attacks targeting a Microsoft SharePoint zero-day vulnerability chain. They used this exploit chain (dubbed “ToolShell”) to breach dozens of organizations worldwide after hacking into their on-premise SharePoint servers. “Microsoft has observed two named Chinese nation-state actors, Linen […]

Microsoft releases emergency patches for SharePoint RCE flaws exploited in attacks

Microsoft has released emergency SharePoint security updates for two zero-day vulnerabilities tracked as CVE-2025-53770 and CVE-2025-53771 that have compromised services worldwide in “ToolShell” attacks. In May, during the Berlin Pwn2Own hacking contest, researchers exploited a zero-day vulnerability chain called “ToolShell,” which enabled them to achieve remote code execution in Microsoft SharePoint. These flaws were fixed as […]

Microsoft SharePoint zero-day exploited in RCE attacks, no patch available

Update 7/21/25: Added links to the security updates for Microsoft SharePoint 2019. Critical zero-day vulnerabilities in Microsoft SharePoint, tracked as CVE-2025-53770 and CVE-2025-53771, have been actively exploited since at least July 18th, with no patch available and at least 85 servers already compromised worldwide. In May, Viettel Cyber Security researchers chained two Microsoft SharePoint flaws, CVE-2025-49706 and […]

Microsoft confirms Windows Server Update Services (WSUS) sync is broken

Microsoft has confirmed a widespread issue in Windows Server Update Services (WSUS) that prevents organizations from syncing with Microsoft Update and deploying the latest Windows updates. Windows Server Update Services (WSUS) is a Microsoft product that allows businesses to manage and distribute Windows updates to computers within their network. By default, WSUS synchronizes with Microsoft […]