On July 19, Microsoft alerted users that it was experiencing an active cyberattack on its SharePoint servers, which allow organizations to share and manage documents.

According to The Washington Post, the attack—which is still ongoing—has likely put “tens of thousands” of servers at risk, including several hosted by federal agencies, universities, and energy companies, which have reportedly already been breached.

According to a blog posted by Microsoft, the hack only impacts SharePoint servers housed within an organization, and not those in the cloud through SharePoint Online in Microsoft 365.

For Microsoft, this latest breach comes after a series of other security concerns in recent years. Last January, the tech giant reported that hackers backed by Russia had successfully stolen some of the company’s source code, and, the following April, a federal review board found that

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