Ruby on Rails has of this writing released patches for a critical security vulnerability affecting nearly all versions of Rails. It is critical that your Rails applications be updated to one of the following versions:
If you have a cPanel server, make sure you have cPanel’s daily updates running. cPanel versions 18.104.22.168, 22.214.171.124, 126.96.36.199, and 188.8.131.52 include the updated versions of Rails. If you are running Rails on a core-managed server, you will need to update Rails yourself. Here’s how.
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