The newly discovered flaw in Microsoft's SharePoint software has allowed hackers to target dozens of companies and organizations. Only a partial fix has been issued.

Microsoft has released security patches for the zero-day vulnerability chain dubbed ToolShell, capable of remote code execution on SharePoint, resulting in the exploitation of at least 54 organizations worldwide.

A July 8 fix for a critical SharePoint zero-day failed to stop active exploitation, enabling state-backed attackers to breach nearly 100 organizations worldwide.