The massive 2017 Equifax hack was done in part by exploiting a critical (though patched) web server vulnerability in Apache Struts, a common and popular form of open source software to creating Java applications. (Equifax)

Cybersecurity startup WhiteSource announced it has raised $75 million in Series D funding, highlighting how tech and security investors are increasingly focusing on the open source software security market.

The latest investment of $75 million, drawn mostly from Pitango Growth and existing investors M12, Susquehanna Growth Equity, and 83North, is significantly more than the approximately $46 million the company raised combined through previous funding rounds. As part of the deal, Pitango Growth managing partner Isaac Hillel will join WhiteSource’s board of directors.

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