Good morning. Microsoft says Chinese hackers exploited flaws in its software. Meme stock fever is spreading like it’s 2021. And heavy metal icon Ozzy Osbourne dies at age 76. Listen to the day’s top stories.

The company uncovers evidence that at least three China-based hacking groups are abusing the zero-day flaw in SharePoint software to access servers.

At least three China-based hacking teams have been exploiting a previously unknown flaw in Microsoft SharePoint since at least July 7, the company said in a blog post. Why it matters: Microsoft and security researchers didn't uncover the vulnerability until this past weekend,