diff --git a/public/main/inc/lib/groupmanager.lib.php b/public/main/inc/lib/groupmanager.lib.php
index fb461a98b3..7c4ce96f3d 100644
--- a/public/main/inc/lib/groupmanager.lib.php
+++ b/public/main/inc/lib/groupmanager.lib.php
@@ -1170,9 +1170,9 @@ class GroupManager
                     g.iid = $group_id";
 
         if (!empty($column) && !empty($direction)) {
-            $column = Database::escape_string($column, null, false);
-            $direction = ('ASC' == $direction ? 'ASC' : 'DESC');
-            $sql .= " ORDER BY $column $direction";
+            $column = Database::escape_string($column);
+            $direction = ('ASC' === $direction ? 'ASC' : 'DESC');
+            $sql .= " ORDER BY `$column` $direction";
         }
 
         if (!empty($start) && !empty($limit)) {
diff --git a/public/main/inc/lib/myspace.lib.php b/public/main/inc/lib/myspace.lib.php
index 816992995c..8d5cc70a6c 100644
--- a/public/main/inc/lib/myspace.lib.php
+++ b/public/main/inc/lib/myspace.lib.php
@@ -556,7 +556,7 @@ class MySpace
             }
         }
         if (!empty($order[$tracking_column])) {
-            $sqlCoachs .= ' ORDER BY '.$order[$tracking_column].' '.$tracking_direction;
+            $sqlCoachs .= " ORDER BY `".$order[$tracking_column]."` ".$tracking_direction;
         }
 
         $result_coaches = Database::query($sqlCoachs);
@@ -1499,6 +1499,12 @@ class MySpace
         $column,
         $direction
     ) {
+        switch ($column) {
+            default:
+            case 1:
+                $column = 'title';
+                break;
+        }
         $courses = CourseManager::get_courses_list(
             $from,
             $numberItems,
@@ -1570,8 +1576,10 @@ class MySpace
                 null,
                 true
             );
-            $progress += $progress_tmp[0];
-            $nb_progress_lp += $progress_tmp[1];
+            if ($progress_tmp) {
+                $progress += $progress_tmp[0];
+                $nb_progress_lp += $progress_tmp[1];
+            }
             $score_tmp = Tracking::get_avg_student_score(
                 $userId,
                 $course,
@@ -2505,9 +2513,9 @@ class MySpace
             $direction = 'ASC';
         }
 
-        $column = intval($column);
-        $from = intval($from);
-        $number_of_items = intval($number_of_items);
+        $column = (int) $column;
+        $from = (int) $from;
+        $number_of_items = (int) $number_of_items;
         $sql .= " ORDER BY col$column $direction ";
         $sql .= " LIMIT $from,$number_of_items";
 
@@ -2637,7 +2645,7 @@ class MySpace
         }
 
         $order = [
-            "$column $direction",
+            " `$column` $direction",
         ];
         $userList = UserManager::get_user_list([], $order, $from, $numberItems);
         $return = [];
@@ -3324,6 +3332,7 @@ class MySpace
         $numberItems = (int) $numberItems;
         $column = (int) $column;
         $orderDirection = Database::escape_string($orderDirection);
+        $orderDirection = !in_array(strtolower(trim($orderDirection)), ['asc', 'desc']) ? 'asc' : $orderDirection;
 
         $user = Database::get_main_table(TABLE_MAIN_USER);
         $course = Database::get_main_table(TABLE_MAIN_COURSE);
diff --git a/public/main/inc/lib/notebook.lib.php b/public/main/inc/lib/notebook.lib.php
index 720c8645f4..132a3eb2cd 100644
--- a/public/main/inc/lib/notebook.lib.php
+++ b/public/main/inc/lib/notebook.lib.php
@@ -216,7 +216,7 @@ class NotebookManager
 
         // Database table definition
         $table = Database::get_course_table(TABLE_NOTEBOOK);
-        $order_by = ' ORDER BY '.$notebookView." $sort_direction ";
+        $order_by = " ORDER BY `$notebookView` $sort_direction ";
 
         // Condition for the session
         $condition_session = api_get_session_condition($sessionId);
diff --git a/public/main/inc/lib/online.inc.php b/public/main/inc/lib/online.inc.php
index 1f2304fa44..5f6f7d730f 100644
--- a/public/main/inc/lib/online.inc.php
+++ b/public/main/inc/lib/online.inc.php
@@ -10,9 +10,6 @@ use ChamiloSession as Session;
  * @author Denes Nagy, principal author
  * @author Bart Mollet
  * @author Roan Embrechts, cleaning and bugfixing
- */
-
-/**
  * Insert a login reference for the current user into the track_e_online stats
  * table. This table keeps trace of the last login. Nothing else matters (we
  * don't keep traces of anything older).
@@ -287,12 +284,11 @@ function who_is_online(
         }
     }
 
-    $direction = strtolower($direction);
 
     if (empty($direction)) {
         $direction = 'DESC';
     } else {
-        if (!in_array($direction, ['asc', 'desc'])) {
+        if (!in_array(strtolower($direction), ['asc', 'desc'])) {
             $direction = 'DESC';
         }
     }
@@ -313,14 +309,14 @@ function who_is_online(
                     friend_user_id <> '".api_get_user_id()."' AND
                     relation_type='".USER_RELATION_TYPE_FRIEND."' AND
                     user_id = '".api_get_user_id()."'
-                  ORDER BY $column $direction
+                  ORDER BY `$column` $direction
                   LIMIT $from, $number_of_items";
     } else {
         $query = "SELECT DISTINCT login_user_id, login_date
                     FROM ".$track_online_table." e
                     INNER JOIN ".$table_user." u ON (u.id = e.login_user_id)
                   WHERE u.status != ".ANONYMOUS." AND login_date >= '".$current_date."'
-                  ORDER BY $column $direction
+                  ORDER BY `$column` $direction
                   LIMIT $from, $number_of_items";
     }
 
@@ -336,7 +332,7 @@ function who_is_online(
                                     login_date >= '".$current_date."' AND
                                     friend_user_id <> '".api_get_user_id()."' AND
                                     relation_type='".USER_RELATION_TYPE_FRIEND."'
-                            ORDER BY $column $direction
+                            ORDER BY `$column` $direction
                             LIMIT $from, $number_of_items";
             } else {
                 // all users online
@@ -346,7 +342,7 @@ function who_is_online(
                           ON (u.id=track.login_user_id)
                           WHERE u.status != ".ANONYMOUS." AND track.access_url_id =  $access_url_id AND
                                 login_date >= '".$current_date."'
-                          ORDER BY $column $direction
+                          ORDER BY `$column` $direction
                           LIMIT $from, $number_of_items";
             }
         }
diff --git a/public/main/inc/lib/sessionmanager.lib.php b/public/main/inc/lib/sessionmanager.lib.php
index b520989b41..f59f1e7b3b 100644
--- a/public/main/inc/lib/sessionmanager.lib.php
+++ b/public/main/inc/lib/sessionmanager.lib.php
@@ -822,7 +822,7 @@ class SessionManager
         $options
     ) {
         //escaping vars
-        $sessionId = 'T' == $sessionId ? 'T' : intval($sessionId);
+        $sessionId = $sessionId === 'T' ? 'T' : intval($sessionId);
         $courseId = intval($courseId);
 
         //tables
@@ -832,7 +832,7 @@ class SessionManager
 
         $course = api_get_course_info_by_id($courseId);
         $sessionCond = 'and session_id = %s';
-        if ('T' == $sessionId) {
+        if ($sessionId === 'T') {
             $sessionCond = '';
         }
 
@@ -849,7 +849,7 @@ class SessionManager
 
         $order = null;
         if (!empty($options['order'])) {
-            $order = " ORDER BY ".$options['order'];
+            $order = " ORDER BY ".$options['order']." ";
         }
 
         $sql = "SELECT u.id as user_id, u.lastname, u.firstname, u.username, u.email, s.c_id
@@ -878,7 +878,7 @@ class SessionManager
             ];
 
             $sessionCond = 'AND v.session_id = %d';
-            if ('T' == $sessionId) {
+            if ($sessionId == 'T') {
                 $sessionCond = "";
             }
 
@@ -6235,7 +6235,7 @@ class SessionManager
 
         if (!empty($column) && !empty($direction)) {
             $column = str_replace('u.', '', $column);
-            $sql .= " ORDER BY $column $direction ";
+            $sql .= " ORDER BY `$column` $direction ";
         }
 
         $limitCondition = '';
diff --git a/public/main/inc/lib/statistics.lib.php b/public/main/inc/lib/statistics.lib.php
index 46d788d9c4..dd49bb15ac 100644
--- a/public/main/inc/lib/statistics.lib.php
+++ b/public/main/inc/lib/statistics.lib.php
@@ -991,7 +991,7 @@ class Statistics
                    HAVING t.c_id <> ''
                    AND DATEDIFF( '".api_get_utc_datetime()."' , access_date ) <= ".$date_diff;
         }
-        $sql .= ' ORDER BY '.$columns[$column].' '.$sql_order[$direction];
+        $sql .= ' ORDER BY `'.$columns[$column].'` '.$sql_order[$direction];
         $from = ($page_nr - 1) * $per_page;
         $sql .= ' LIMIT '.$from.','.$per_page;
 
diff --git a/public/main/inc/lib/tracking.lib.php b/public/main/inc/lib/tracking.lib.php
index a684555285..5853fe7dff 100644
--- a/public/main/inc/lib/tracking.lib.php
+++ b/public/main/inc/lib/tracking.lib.php
@@ -3828,7 +3828,7 @@ class Tracking
             if (in_array($orderByName, ['name', 'access_start_date'])) {
                 $orderByDirection = in_array(strtolower($orderByDirection), ['asc', 'desc']) ? $orderByDirection : 'asc';
                 $orderByName = Database::escape_string($orderByName);
-                $orderBy .= " ORDER BY $orderByName $orderByDirection";
+                $orderBy .= " ORDER BY `$orderByName` $orderByDirection";
             }
         }
 
@@ -7729,7 +7729,8 @@ class TrackingCourseLog
         $table_item_property = Database::get_course_table(TABLE_ITEM_PROPERTY);
         $table_user = Database::get_main_table(TABLE_MAIN_USER);
         $table_session = Database::get_main_table(TABLE_MAIN_SESSION);
-        $session_id = intval($session_id);
+        $column = (int) $column;
+        $direction = !in_array(strtolower(trim($direction)), ['asc', 'desc']) ? 'asc' : $direction;
 
         $sql = "SELECT
                     tool as col0,
diff --git a/public/main/inc/lib/usermanager.lib.php b/public/main/inc/lib/usermanager.lib.php
index 723e6bad75..5a12140ef7 100644
--- a/public/main/inc/lib/usermanager.lib.php
+++ b/public/main/inc/lib/usermanager.lib.php
@@ -2163,8 +2163,8 @@ class UserManager
             $field_filter = (int) $field_filter;
             $sqlf .= " AND filter = $field_filter ";
         }
-        $sqlf .= " ORDER BY ".$columns[$column]." $sort_direction ";
-        if (0 != $number_of_items) {
+        $sqlf .= " ORDER BY `".$columns[$column]."` $sort_direction ";
+        if ($number_of_items != 0) {
             $sqlf .= " LIMIT ".intval($from).','.intval($number_of_items);
         }
         $resf = Database::query($sqlf);
@@ -4650,7 +4650,7 @@ class UserManager
             if (!empty($column) && !empty($direction)) {
                 // Fixing order due the UNIONs
                 $column = str_replace('u.', '', $column);
-                $orderBy = " ORDER BY $column $direction ";
+                $orderBy = " ORDER BY `$column` $direction ";
             }
         }
 
diff --git a/public/main/session/session_category_list.php b/public/main/session/session_category_list.php
index c222a20659..1a03313d6c 100644
--- a/public/main/session/session_category_list.php
+++ b/public/main/session/session_category_list.php
@@ -84,7 +84,7 @@ if (isset($_GET['search']) && 'advanced' === $_GET['search']) {
                 ) as nbr_session
 	 			FROM $tbl_session_category sc
 	 			$where
-	 			ORDER BY $sort $order
+	 			ORDER BY `$sort` $order
 	 			LIMIT $from,".($limit + 1);
 
     $query_rows = "SELECT count(*) as total_rows
diff --git a/public/main/session/session_course_list.php b/public/main/session/session_course_list.php
index 95518d6be8..f3a6fb9a24 100644
--- a/public/main/session/session_course_list.php
+++ b/public/main/session/session_course_list.php
@@ -58,7 +58,7 @@ $from = $page * $limit;
 $sql = "SELECT c.id, c.code, c.title, nbr_users
 		FROM $tbl_session_rel_course, $tbl_course c
 		WHERE c_id = c.id AND session_id='$id_session'
-		ORDER BY $sort
+		ORDER BY `$sort`
 		LIMIT $from,".($limit + 1);
 $result = Database::query($sql);
 $Courses = Database::store_result($result);
diff --git a/public/main/session/session_course_user_list.php b/public/main/session/session_course_user_list.php
index 26c33cb133..0750f6ac9d 100644
--- a/public/main/session/session_course_user_list.php
+++ b/public/main/session/session_course_user_list.php
@@ -102,7 +102,7 @@ $sql = "
     WHERE
         s.session_id = $id_session AND
         url.access_url_id = $urlId
-    ORDER BY $sort $direction
+    ORDER BY `$sort` $direction
     LIMIT $from,".($limit + 1);
 
 if ('desc' === $direction) {
diff --git a/public/main/user/subscribe_user.php b/public/main/user/subscribe_user.php
index 17d31b4406..fa89cab225 100644
--- a/public/main/user/subscribe_user.php
+++ b/public/main/user/subscribe_user.php
@@ -659,6 +659,8 @@ function get_user_data($from, $number_of_items, $column, $direction)
     }
 
     $sql .= " AND u.status != ".ANONYMOUS." ";
+    $column = (int) $column;
+    $direction = !in_array(strtolower(trim($direction)), ['asc', 'desc']) ? 'asc' : $direction;
     // Sorting and pagination (used by the sortable table)
     $sql .= " ORDER BY col$column $direction ";
     $from = (int) $from;
diff --git a/public/main/webservices/cm_webservice_inbox.php b/public/main/webservices/cm_webservice_inbox.php
index 9890df9280..348550f7c9 100644
--- a/public/main/webservices/cm_webservice_inbox.php
+++ b/public/main/webservices/cm_webservice_inbox.php
@@ -106,13 +106,17 @@ class WSCMInbox extends WSCM
         $from,
         $number_of_items
     ) {
+        $from = (int) $from;
+        $number_of_items = (int) $number_of_items;
+
         if ("valid" == $this->verifyUserPass($username, $password)) {
             $user_id = UserManager::get_user_id_from_username($username);
 
             $table_message = Database::get_main_table(TABLE_MESSAGE);
             $sql_query = "SELECT id FROM $table_message 
                           WHERE user_sender_id=".$user_id." AND msg_status=".MESSAGE_STATUS_OUTBOX." 					 
-                          ORDER BY send_date LIMIT $from,$number_of_items";
+                          ORDER BY send_date
+                          LIMIT $from,$number_of_items";
 
             $sql_result = Database::query($sql_query);
             $message = "#";
diff --git a/public/main/webservices/cm_webservice_user.php b/public/main/webservices/cm_webservice_user.php
index d47876c543..d99bf9ed0f 100644
--- a/public/main/webservices/cm_webservice_user.php
+++ b/public/main/webservices/cm_webservice_user.php
@@ -195,7 +195,7 @@ class WSCMUser extends WSCM
         }
         $order = '';
         foreach ($order_by as $orderByItem) {
-            $order .= Database::escape_string($orderByItem, null, false).', ';
+            $order .= Database::escape_string($orderByItem).', ';
         }
         $order = substr($order, 0, -2);
         if (count($order_by) > 0) {