In WordPress version 5.0.1 there was a bug which would mean that uploading a CSV file could present the error “Sorry, This File Type Is Not Permitted for Security Reasons”. This was resolved after 5.0.3, but some users with special characters in their CSV files may still receive this error moving forward.
There are a few things to try if your CSV importer is presenting this error:
- Update your WordPress to the latest version.
- Try saving the file with UTF-8 encoding (as per this guide)
- If that doesn’t work, special characters are likely causing WordPress to reject your CSV file. The current workaround is to install and activate the Disable Real Mime Check plugin. Your CSV imports will probably work then. We recommend deactivating this plugin after importing your CSV file.