This permissions correction will be in the next release version of UBB.threads. If anyone needs this fixed right now and cannot wait until the next release, the fix is simple:

in /scripts/showflat.inc.php
FIND
Code
if ($ext == "pdf") {

REPLACE WITH
Code
if ($ext == "pdf" && $userob->check_access("forum", "CAN_DOWNLOAD", $topic_info['FORUM_ID'])) {

thats all.

Outdoorking - thank you for this thumbsup

Attachments
20180930_14-01-27.PNG 20180930_14-01-13.PNG

Current developer of UBB.threads PHP Forum Software
Current Release: UBBT 7.7.5 // Preview: UBBT 8.0.0
isaac @ id242.com // my forum @ CelicaHobby.com