A critical vulnerability in Microsoft's SharePoint, tracked as CVE-2025-53770, is being actively exploited, allowing unauthenticated remote code execution on affected servers. The vulnerability has led to significant incidents, including breaches in multiple organizations, with estimates of compromised systems rising to 400. Government and private sectors are currently grappling with the fallout from this mass exploitation.

Recent attacks linked to Chinese hacking groups have exploited a zero-day vulnerability in Microsoft SharePoint, breaching numerous organizations globally. The vulnerabilities, identified as CVE-2025-49706 and CVE-2025-49704, were actively targeted by multiple threat actors, prompting Microsoft and CISA to release emergency patches and recommend immediate action for affected entities.

Microsoft issued an emergency security update for a critical vulnerability in SharePoint Server, known as CVE-2025-53770, which is actively being exploited by hackers to breach various organizations, including U.S. federal agencies. The flaw allows attackers to access and control compromised servers using a backdoor tool named "ToolShell," prompting urgent recommendations for organizations to take immediate protective measures beyond just patching.