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-rw-r--r--comments.php2
1 files changed, 2 insertions, 0 deletions
diff --git a/comments.php b/comments.php
index cda791ca6..0ffb05d97 100644
--- a/comments.php
+++ b/comments.php
@@ -104,6 +104,8 @@ $page['where_clauses'] = array();
// which category to filter on ?
if (isset($_GET['cat']) and 0 != $_GET['cat'])
{
+ check_input_parameter('cat', $_GET, false, PATTERN_ID);
+
$page['where_clauses'][] =
'category_id IN ('.implode(',', get_subcat_ids(array($_GET['cat']))).')';
}