Allowed File Types of Iptanus File Upload Plugin

This article explains which file types the Iptanus File Upload plugin allows, and how to change the list.

Why the error appeared

After updating the plugin to version 3.9.0 or newer, many users started seeing an error that had not appeared before: “Upload failed! File not allowed.“

It is caused by the plugin’s security policy, which changed in that version to restrict the file types that can be uploaded. The point of the change is to protect sites better against attacks such as arbitrary file uploads.

The whitelist

Under the new policy, the default *.* in the plugin’s Allowed File Extensions option no longer permits every file type — only a specific set. Administrators are strongly encouraged to define their own list of allowed extensions rather than leave the generic *.* in place.

The blacklist

Even with a list of your own, not every extension on it is guaranteed to work. The plugin also keeps a list of forbidden extensions, and it checks that list first: anything on it is rejected whatever your settings say.

Check an extension

To find out whether an extension is allowed by default, needs adding to Allowed File Extensions, or is forbidden outright, type it below and press Check.