In a nutshell: A critical SharePoint vulnerability is actively exploited immediately after Microsoft’s patch day; rapid system updates are required.
A critical security vulnerability in Microsoft SharePoint is actively exploited immediately after the current patch day to inject malicious code into enterprise environments.
Security researchers are observing attack activities against a critical security vulnerability in Microsoft SharePoint that began shortly after the corresponding patches became available. Attackers are exploiting this vulnerability to inject malicious code directly into affected systems.
For security leaders, this means increased attack risk during a phase when patch distribution is unlikely to be completed across the board. The rapid exploitation following patch release indicates a targeted approach and significantly reduces the window of time available for defensive measures.
Administrators should prioritize updating their SharePoint installations and check whether systems already show signs of compromise. Timely patch deployment is essential to close the attack window.
Source: www.golem.de · Published 17 July 2026
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