Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.
Created drupal7 tracking bugs for this issue:
Affects: epel-7 [bug 1900798]
Affects: fedora-all [bug 1900797]
Created drupal8 tracking bugs for this issue:
Affects: fedora-all [bug 1900796]
All dependant bugs have been closed... please close this bug