diff --git a/classes/task/get_meeting_reports.php b/classes/task/get_meeting_reports.php
index 991260ad..b0ed1562 100644
--- a/classes/task/get_meeting_reports.php
+++ b/classes/task/get_meeting_reports.php
@@ -866,8 +866,11 @@ public function notify_teachers($data) {
         // Number of users need to be graded.
         $needgradenumber = count($data['needgrade']);
         // List of users need grading.
-        $needstring = get_string('grading_needgrade', 'mod_zoom');
-        $needgrade = (!empty($data['needgrade'])) ? $needstring . implode('<br>', $data['needgrade']) . "\n" : '';
+        $needgrade = '';
+        if (!empty($data['needgrade'])) {
+            $safeneedgrade = array_map('s', $data['needgrade']);
+            $needgrade = get_string('grading_needgrade', 'mod_zoom') . implode('<br>', $safeneedgrade) . "\n";
+        }
 
         $zoomid = $data['zoomid'];
         $itemid = $data['itemid'];
diff --git a/console/get_meeting_report.php b/console/get_meeting_report.php
index 826220d0..cb856abd 100644
--- a/console/get_meeting_report.php
+++ b/console/get_meeting_report.php
@@ -45,16 +45,8 @@
 $PAGE->set_url('/mod/zoom/console/');
 
 echo html_writer::tag('h1', get_string('getmeetingreports', 'mod_zoom'));
-$output = null;
-$arguments = implode(
-    ' ',
-    [
-        '--start=' . escapeshellarg($startdate),
-        '--end=' . escapeshellarg($enddate),
-        '--courseid=' . escapeshellarg($courseid),
-    ]
-);
-exec("php $CFG->dirroot/mod/zoom/cli/get_meeting_report.php $arguments", $output);
 echo '<pre>';
-echo implode("\n", $output);
+$hostuuids = $DB->get_fieldset_select('zoom', 'DISTINCT host_id', 'course = ?', [$courseid]);
+$meetingtask = new \mod_zoom\task\get_meeting_reports();
+$meetingtask->execute($startdate, $enddate, $hostuuids);
 echo '</pre>';
diff --git a/db/upgrade.php b/db/upgrade.php
index 064cc0d9..15beb609 100755
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -61,7 +61,7 @@ function xmldb_zoom_upgrade($oldversion) {
         // Rename option_no_video_host to option_host_video; change default to 1; invert values.
         $field = new xmldb_field('option_no_video_host', XMLDB_TYPE_INTEGER, '1', null, null, null, '1', 'option_start_type');
         // Invert option_no_video_host.
-        $DB->set_field('UPDATE {zoom} SET option_no_video_host = 1 - option_no_video_host');
+        $DB->execute('UPDATE {zoom} SET option_no_video_host = 1 - option_no_video_host');
         $dbman->change_field_default($table, $field);
         $dbman->rename_field($table, $field, 'option_host_video');
 
@@ -77,7 +77,7 @@ function xmldb_zoom_upgrade($oldversion) {
             'option_host_video'
         );
         // Invert option_no_video_participants.
-        $DB->set_field('UPDATE {zoom} SET option_no_video_participants = 1 - option_no_video_participants');
+        $DB->execute('UPDATE {zoom} SET option_no_video_participants = 1 - option_no_video_participants');
         $dbman->change_field_default($table, $field);
         $dbman->rename_field($table, $field, 'option_participants_video');
 
@@ -95,7 +95,7 @@ function xmldb_zoom_upgrade($oldversion) {
         // Change precision/length of duration to 6 digits.
         $field = new xmldb_field('duration', XMLDB_TYPE_INTEGER, '6', null, null, null, null, 'type');
         $dbman->change_field_precision($table, $field);
-        $DB->set_field('UPDATE {zoom} SET duration = duration*60');
+        $DB->execute('UPDATE {zoom} SET duration = duration*60');
 
         upgrade_mod_savepoint(true, 2015071500, 'zoom');
     }
diff --git a/index.php b/index.php
index 6c714ece..30eff0b4 100755
--- a/index.php
+++ b/index.php
@@ -60,8 +60,8 @@
 
 $PAGE->set_url('/mod/zoom/index.php', ['id' => $id]);
 $PAGE->navbar->add($strname);
-$PAGE->set_title("$course->shortname: $strname");
-$PAGE->set_heading($course->fullname);
+$PAGE->set_title(format_string("$course->shortname: $strname", true, ['context' => $context]));
+$PAGE->set_heading(format_string($course->fullname, true, ['context' => $context]));
 $PAGE->set_pagelayout('incourse');
 
 echo $OUTPUT->header();
diff --git a/lib.php b/lib.php
index 9bba84be..4018d9b5 100755
--- a/lib.php
+++ b/lib.php
@@ -1108,7 +1108,12 @@ function zoom_update_instance_breakout_rooms($zoomid, $breakoutrooms) {
 function zoom_delete_instance_breakout_rooms($zoomid) {
     global $DB;
 
-    $zoomcurrentbreakoutroomsids = $DB->get_fieldset_select('zoom_meeting_breakout_rooms', 'id', "zoomid = {$zoomid}");
+    $zoomcurrentbreakoutroomsids = $DB->get_fieldset_select(
+        'zoom_meeting_breakout_rooms',
+        'id',
+        'zoomid = ?',
+        [$zoomid]
+    );
 
     foreach ($zoomcurrentbreakoutroomsids as $id) {
         $DB->delete_records('zoom_breakout_participants', ['breakoutroomid' => $id]);
diff --git a/locallib.php b/locallib.php
index 0e2d879e..6f7b574e 100755
--- a/locallib.php
+++ b/locallib.php
@@ -143,7 +143,7 @@ function zoom_fatal_error($errorcode, $module = '', $continuelink = '', $a = nul
         throw new moodle_exception($errorcode, $module, $continuelink, $a);
     }
 
-    $PAGE->set_heading($COURSE->fullname);
+    $PAGE->set_heading(format_string($COURSE->fullname));
     $output .= $OUTPUT->header();
 
     // Output message without messing with HTML content of error.
@@ -270,7 +270,7 @@ function zoom_get_sessions_for_display($zoomid) {
         $sessions[$uuid]['topic'] = $instance->topic;
         $sessions[$uuid]['duration'] = $instance->duration;
         $sessions[$uuid]['starttime'] = userdate($instance->start_time, $format);
-        $sessions[$uuid]['endtime'] = userdate($instance->start_time + $instance->duration * 60, $format);
+        $sessions[$uuid]['endtime'] = userdate($instance->start_time + $instance->duration, $format);
     }
 
     return $sessions;
@@ -504,7 +504,7 @@ function zoom_get_participants_report($detailsid) {
  */
 function zoom_create_default_passcode($meetingpasswordrequirement) {
     $length = max($meetingpasswordrequirement->length, 6);
-    $random = rand(0, pow(10, $length) - 1);
+    $random = random_int(0, (int) pow(10, $length) - 1);
     $passcode = str_pad(strval($random), $length, '0', STR_PAD_LEFT);
 
     // Get a random set of indexes to replace with non-numberic values.
@@ -513,14 +513,14 @@ function zoom_create_default_passcode($meetingpasswordrequirement) {
 
     if ($meetingpasswordrequirement->have_letter || $meetingpasswordrequirement->have_upper_and_lower_characters) {
         // Random letter from A-Z.
-        $passcode[$indexes[0]] = chr(rand(65, 90));
+        $passcode[$indexes[0]] = chr(random_int(65, 90));
         // Random letter from a-z.
-        $passcode[$indexes[1]] = chr(rand(97, 122));
+        $passcode[$indexes[1]] = chr(random_int(97, 122));
     }
 
     if ($meetingpasswordrequirement->have_special_character) {
         $specialchar = '@_*-';
-        $passcode[$indexes[2]] = substr(str_shuffle($specialchar), 0, 1);
+        $passcode[$indexes[2]] = $specialchar[random_int(0, strlen($specialchar) - 1)];
     }
 
     return $passcode;
diff --git a/participants.php b/participants.php
index 40c5a724..5a1a64c6 100644
--- a/participants.php
+++ b/participants.php
@@ -43,11 +43,11 @@
 
 $PAGE->set_url('/mod/zoom/participants.php', ['id' => $cm->id, 'uuid' => $uuid, 'export' => $export]);
 
-$strname = $zoom->name;
+$activityname = $zoom->name;
 $strtitle = get_string('participants', 'mod_zoom');
 $PAGE->navbar->add($strtitle);
-$PAGE->set_title("$course->shortname: $strname");
-$PAGE->set_heading($course->fullname);
+$PAGE->set_title(format_string("$course->shortname: $activityname", true, ['context' => $context]));
+$PAGE->set_heading(format_string($course->fullname, true, ['context' => $context]));
 $PAGE->set_pagelayout('incourse');
 
 $maskparticipantdata = get_config('zoom', 'maskparticipantdata');
@@ -66,7 +66,7 @@
 // Display the headers/etc if we're not exporting, or if there is no data.
 if (empty($export) || empty($participants)) {
     echo $OUTPUT->header();
-    echo $OUTPUT->heading($strname);
+    echo $OUTPUT->heading(format_string($activityname, true, ['context' => $context]));
     echo $OUTPUT->heading($strtitle, 4);
 
     // Stop if there is no data.
@@ -116,12 +116,11 @@
     }
 
     // ID number.
+    $idnumber = '';
     if (array_key_exists($p->userid, $moodleidtouids)) {
-        $row[] = $moodleidtouids[$p->userid];
+        $idnumber = $moodleidtouids[$p->userid];
     } else if (isset($moodleuser->idnumber)) {
-        $row[] = $moodleuser->idnumber;
-    } else {
-        $row[] = '';
+        $idnumber = $moodleuser->idnumber;
     }
 
     // Name/email.
@@ -135,12 +134,21 @@
 
     // Put email in separate column if we are exporting to Excel.
     if (!empty($export)) {
-        $row[] = $name;
-        $row[] = $email;
-    } else if (!empty($email)) {
-        $row[] = html_writer::link("mailto:$email", $name);
+        $row = [
+            $idnumber,
+            $name,
+            $email,
+        ];
     } else {
-        $row[] = $name;
+        $safename = format_string($name, true, ['context' => $context]);
+        if (!empty($email)) {
+            $safename = html_writer::link("mailto:$email", $safename);
+        }
+
+        $row = [
+            s($idnumber),
+            $safename,
+        ];
     }
 
     // Join/leave times.
diff --git a/recordings.php b/recordings.php
index c358e9ac..81c2f73c 100644
--- a/recordings.php
+++ b/recordings.php
@@ -41,13 +41,13 @@
 $url = new moodle_url('/mod/zoom/recordings.php', $params);
 $PAGE->set_url($url);
 
-$strname = $zoom->name;
-$PAGE->set_title("$course->shortname: $strname");
-$PAGE->set_heading($course->fullname);
+$activityname = $zoom->name;
+$PAGE->set_title(format_string("$course->shortname: $activityname", true, ['context' => $context]));
+$PAGE->set_heading(format_string($course->fullname, true, ['context' => $context]));
 $PAGE->set_pagelayout('incourse');
 
 echo $OUTPUT->header();
-echo $OUTPUT->heading($strname);
+echo $OUTPUT->heading(format_string($activityname, true, ['context' => $context]));
 
 $iszoommanager = has_capability('mod/zoom:addinstance', $context);
 
diff --git a/report.php b/report.php
index 7ee5b46e..384c84fa 100755
--- a/report.php
+++ b/report.php
@@ -38,15 +38,15 @@
 
 $PAGE->set_url('/mod/zoom/report.php', ['id' => $cm->id]);
 
-$strname = $zoom->name;
+$activityname = $zoom->name;
 $strtitle = get_string('sessions', 'mod_zoom');
 $PAGE->navbar->add($strtitle);
-$PAGE->set_title("$course->shortname: $strname");
-$PAGE->set_heading($course->fullname);
+$PAGE->set_title(format_string("$course->shortname: $activityname", true, ['context' => $context]));
+$PAGE->set_heading(format_string($course->fullname, true, ['context' => $context]));
 $PAGE->set_pagelayout('incourse');
 
 echo $OUTPUT->header();
-echo $OUTPUT->heading($strname);
+echo $OUTPUT->heading(format_string($activityname, true, ['context' => $context]));
 echo $OUTPUT->heading($strtitle, 4);
 
 $sessions = zoom_get_sessions_for_display($zoom->id);
@@ -65,7 +65,7 @@
 
     foreach ($sessions as $uuid => $meet) {
         $row = [];
-        $row[] = $meet['topic'];
+        $row[] = format_string($meet['topic'], true, ['context' => $context]);
         $row[] = $meet['starttime'];
         $row[] = $meet['endtime'];
         $row[] = format_time($meet['duration']);
diff --git a/view.php b/view.php
index 1f31fc5e..a071f274 100755
--- a/view.php
+++ b/view.php
@@ -50,8 +50,8 @@
 // Print the page header.
 
 $PAGE->set_url('/mod/zoom/view.php', ['id' => $cm->id]);
-$PAGE->set_title(format_string($zoom->name));
-$PAGE->set_heading(format_string($course->fullname));
+$PAGE->set_title(format_string($zoom->name, true, ['context' => $context]));
+$PAGE->set_heading(format_string($course->fullname, true, ['context' => $context]));
 $PAGE->requires->js_call_amd("mod_zoom/toggle_text", 'init');
 
 // Get Zoom user ID of current Moodle user.
@@ -127,7 +127,7 @@
 echo $OUTPUT->header();
 
 if ($CFG->branch < '400') {
-    echo $OUTPUT->heading(format_string($zoom->name), 2);
+    echo $OUTPUT->heading(format_string($zoom->name, true, ['context' => $context]), 2);
 }
 
 // Show notification if the meeting does not exist on Zoom.
@@ -591,7 +591,7 @@
         $meetinginvite = zoom_webservice()->get_meeting_invitation($zoom)->get_display_string($cm->id);
         // Show meeting invitation if there is any.
         if (!empty($meetinginvite)) {
-            $meetinginvitetext = str_replace("\r\n", '<br/>', $meetinginvite);
+            $meetinginvitetext = str_replace("\r\n", '<br/>', s($meetinginvite));
             $showbutton = html_writer::tag(
                 'button',
                 $strmeetinginviteshow,