diff --git a/inc/command/cleanticketscommand.class.php b/inc/command/cleanticketscommand.class.php
new file mode 100644
index 000000000..65080a896
--- /dev/null
+++ b/inc/command/cleanticketscommand.class.php
@@ -0,0 +1,196 @@
+<?php
+/**
+ * ---------------------------------------------------------------------
+ * Formcreator is a plugin which allows creation of custom forms of
+ * easy access.
+ * ---------------------------------------------------------------------
+ * LICENSE
+ *
+ * This file is part of Formcreator.
+ *
+ * Formcreator is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Formcreator is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Formcreator. If not, see <http://www.gnu.org/licenses/>.
+ * ---------------------------------------------------------------------
+ * @copyright Copyright © 2011 - 2021 Teclib'
+ * @license   http://www.gnu.org/licenses/gpl.txt GPLv3+
+ * @link      https://github.com/pluginsGLPI/formcreator/
+ * @link      https://pluginsglpi.github.io/formcreator/
+ * @link      http://plugins.glpi-project.org/#/plugin/formcreator
+ * ---------------------------------------------------------------------
+ */
+
+namespace GlpiPlugin\Formcreator\Command;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Ticket;
+use Item_Ticket;
+use PluginFormcreatorFormAnswer;
+use Glpi\Toolbox\Sanitizer;
+
+class CleanTicketsCommand extends Command
+{
+   protected function configure() {
+      $this
+         ->setName('glpi:plugins:formcreator:clean_tickets')
+         ->setDescription("Clean Tickets having visible HTML tags in their content");
+   }
+
+   protected function execute(InputInterface $input, OutputInterface $output) {
+      $output->write("<info>-> Search tickets to clean...</info>");
+      $output->writeln("");
+
+      $this->fixBadForm_1($input, $output);
+      $this->fixBadForm_2($input, $output);
+
+      $output->writeln('<info>Done.</info>');
+      return 0;
+   }
+
+   /**
+    * fix HTML tags double encoded
+    * <p> => &lt;p&gt; => &#38;lt;p&#38;gt;
+    *
+    * @param InputInterface $input
+    * @param OutputInterface $output
+    * @return void
+    */
+   protected function fixBadForm_1(InputInterface $input, OutputInterface $output) {
+      global $DB;
+
+      // Search tickets having HTML tags in content in the following form
+      // &#38;lt;p&#38;gt;Hello world&#38;lt;/p&#38;gt;
+      // Hello world is between <p> and </p>, but with wrong escaping
+      $itemTicketTable = Item_Ticket::getTable();
+      $ticketTable = Ticket::getTable();
+      $pattern = '&#38;lt;';
+      // $pattern = str_replace(';', '\\;', $pattern);
+      $tickets = $DB->request([
+         'SELECT' => [$ticketTable => [Ticket::getIndexName(), 'content']],
+         'FROM' => $ticketTable,
+         'INNER JOIN' => [
+            $itemTicketTable => [
+               'FKEY' => [
+                  $ticketTable => Ticket::getIndexName(),
+                  $itemTicketTable => Ticket::getForeignKeyField(),
+               ],
+               'AND' => [
+                  "$itemTicketTable.itemtype" => PluginFormcreatorFormAnswer::getType(),
+               ]
+            ],
+         ],
+         'WHERE' => [
+            "$ticketTable.content" => ['LIKE', '%' . $pattern . '%'], // Matches bad encoding for '<'
+         ],
+      ]);
+
+      $count = $tickets->count();
+      if ($count < 1) {
+         $output->writeln('<info>-> No ticket to fix.</info>');
+         $output->writeln("");
+         return 0;
+      }
+
+      $output->write("<info>-> Found $count tickets to clean</info>");
+      $output->writeln("");
+      $output->write("<info>-> Cleaning tickets...</info>");
+      $output->writeln("");
+      foreach ($tickets as $row) {
+         $pattern = [
+            '/&#38;lt;([a-z0-9]+?)&#38;gt;/',
+            '/&#38;lt;(\/[a-z0-9]+?)&#38;gt;/',
+         ];
+         $replace = [
+            '&#60;$1&#62;',
+            '&#60;$1&#62;',
+         ];
+         $row['content'] = preg_replace($pattern, $replace, $row['content']);
+         // Direct write to the table to avoid alteration of other fields
+         $DB->update(
+            $ticketTable,
+            [
+               'content' => $DB->escape($row['content'])
+            ],
+            [
+               'id' => $row['id'],
+            ]
+         );
+      }
+   }
+
+   /**
+    * remove HTML tag <br />
+    *
+    * @param InputInterface $input
+    * @param OutputInterface $output
+    * @return void
+    */
+   protected function fixBadForm_2(InputInterface $input, OutputInterface $output) {
+      global $DB;
+
+      // Search tickets having HTML tags <br />
+      $itemTicketTable = Item_Ticket::getTable();
+      $ticketTable = Ticket::getTable();
+      $pattern = 'br /';
+      $tickets = $DB->request([
+         'SELECT' => [$ticketTable => [Ticket::getIndexName(), 'content']],
+         'FROM' => $ticketTable,
+         'INNER JOIN' => [
+            $itemTicketTable => [
+               'FKEY' => [
+                  $ticketTable => Ticket::getIndexName(),
+                  $itemTicketTable => Ticket::getForeignKeyField(),
+               ],
+               'AND' => [
+                  "$itemTicketTable.itemtype" => PluginFormcreatorFormAnswer::getType(),
+               ]
+            ],
+         ],
+         'WHERE' => [
+            "$ticketTable.content" => ['LIKE', '%' . $pattern . '%'], // Matches bad encoding for '<'
+         ],
+      ]);
+
+      $count = $tickets->count();
+      if ($count < 1) {
+         $output->writeln('<info>-> No ticket to fix.</info>');
+         $output->writeln("");
+         return 0;
+      }
+
+      $output->write("<info>-> Found $count tickets to clean</info>");
+      $output->writeln("");
+      $output->write("<info>-> Cleaning tickets...</info>");
+      $output->writeln("");
+      foreach ($tickets as $row) {
+         $pattern = [
+            '<br />',
+         ];
+         $replace = [
+            '&lt;div&gt;&lt;/div&gt;',
+         ];
+         $row['content'] = str_replace($pattern, $replace, $row['content']);
+         // Direct write to the table to avoid alteration of other fields
+         $DB->update(
+            $ticketTable,
+            [
+               'content' => $DB->escape($row['content'])
+            ],
+            [
+               'id' => $row['id'],
+            ]
+         );
+      }
+   }
+}