The company said state-backed hacking groups were breaching systems through flaws in SharePoint, which is used by the U.S. government and companies around the world.

Hackers in recent weeks have exploited flaws in SharePoint, a document management system developed by Microsoft Corp., to try to steal sensitive data from hundreds of victims.

Investors are desensitized to cyberattacks and have other issues on their mind ahead of Microsoft’s earnings report next week, analysts say.