The Acronym Mod which is included in phpBB XS 2 Build 058b is Vulnerable and should be fixed ASAP.
Please make these codechanges in the file /adm/admin_acronyms.php
OPEN admin_acronyms.php
FIND
REPLACE WITH
FIND
REPLACE WITH
FIND
$acronym_id = ( isset($_POST['id']) ) ? $_POST['id'] : $_GET['id'];
REPLACE WITH
$acronym_id = ( isset($_POST['id']) ) ? intval($_POST['id']) : intval($_GET['id']);
Thanks MG to FIX.
Greets