In this article I read, that using
<a href="" target="blank"> is related to some security issues. They recommend
How do I implement this in my WP-Installation? Which file is the relevant one? Thank you.
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This function is used to filter through the various input data just before saving it, e.g.
Since 5.2 the following improvements are made:
There are open tickets to further refine it, e.g.
If you have some custom user input that allows external links, then you could use:
$text = wp_targeted_link_rel( $text );
to handle it.
The default relation values
'noopener noreferrer' are also filterable through the
"Wich file is the relevant one" = All files that allow user generated content to be viewed.
You have to change hook into the_content to change the URLs and add noopener
There is a great answer here: How to add nofollow on all external links without plugin? (and here: A plugin for having rel="nofollow" in posts? ) you should look into.