Multiple security updates have been released today for contributed modules on drupal.org. 
If you use the REST Views or Advanced Progressive Web App (PWA) modules, you should update as soon as possible to ensure your site's security.
The REST Views module had a moderately critical information disclosure vulnerability. 
Versions before 3.0.1 did not properly check access, potentially exposing paths to unpublished content and entities referenced from REST exports. 

Many people jump to the conclusion that decoupling will solve problems unrelated to a decoupled architecture. Decoupling doesn’t mean a website will have a cleaner content model or a responsive design.
hose are separate solutions for separate problem sets.

two of the key advantages are:

Clean APIs for mobile apps: Since the website front-end is consuming the same APIs as mobile apps, app developers know that they aren’t a second-tier audience.