By paulocs on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
9.2.x
Introduced in version: 
9.2.1
Issue links: 
https://www.drupal.org/node/3166044
Description: 

Now a site admin can allow the site user to upload files that have an underscore in their extension.

Before

Not allowed:

  • example.x_t
  • example.x.t
  • example.x_y_t

After

Allowed

  • example.x_t
  • example.x.t
  • example.x_y_t

But the following are invalid:

  • example.x_.t
  • example.x._t
  • example.xt_
  • example.x__t
  • example._xt

Allowed characters in extension are a-z, 0-9, '.', and '_'. The first and last characters cannot be '.' or '_', and these two characters cannot appear next to each other.

Impacts: 
Site builders, administrators, editors
Module developers