Is it safe to permission set 777 for var?

Question

I saw 'Never use 777 for security reason' and I also found Magento 2 recommended permission setup on Magento 2 folder/file permissions

find ./var -type d -exec chmod 777 {} \;
find ./pub/media -type d -exec chmod 777 {} \;
find ./pub/static -type d -exec chmod 777 {} \;

Is it safe to use 777 for those and why?

Answer 1

I don't think this is recommended?

Where did you find this?

Refer the official documentation: https://devdocs.magento.com/guides/v2.4/install-gde/composer.html