5 Security Things to Know for the Week of Feb. 27

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1) A massive vulnerability in the content optimization provider Cloudflare potentially exposed user data from thousands of websites.

2) The U.S. Food and Drug Administration introduced additional guidance regarding medical device security.

3) Google revealed a successful SHA-1 collision attack.

4) A more-than-decade-old Linux kernel root flaw was disclosed and patched.

5) Windows 10 will allow admins to block apps if they are not from the Windows Store.