diff --git a/event/main_listener.php b/event/main_listener.php
index dda6095..6fedbff 100644
--- a/event/main_listener.php
+++ b/event/main_listener.php
@@ -355,11 +355,17 @@ public function acp_manage_forums_update_data_after($event)
 	// MCP
 	public function mcp_forum_view_before($event)
 	{
-		$attr_id = (int) $this->request->variable('attr_id', 0);
+		add_form_key('qte_mcp_attr_apply', '_QTE');
+		$attr_id = (int) $this->request->variable('attr_id', 0, false, \phpbb\request\request_interface::POST);
 		$forum_id = (int) $event['forum_info']['forum_id'];
 
 		if ($attr_id)
 		{
+			if (!check_form_key('qte_mcp_attr_apply'))
+			{
+				trigger_error($this->language->lang('FORM_INVALID'));
+			}
+
 			$this->qte->mcp_attr_apply($attr_id, $forum_id, $event['topic_id_list']);
 		}
 
@@ -635,6 +641,11 @@ public function viewtopic_add_quickmod_option_before($event)
 
 		if ($attr_id)
 		{
+			if (!check_link_hash($this->request->variable('hash', ''), 'qte_attr_apply'))
+			{
+				return;
+			}
+
 			$this->qte->get_users_by_user_id($this->user->data['user_id']);
 			$this->qte->attr_apply($attr_id, $event['topic_id'], $event['forum_id'], $event['topic_data']['topic_attr_id'], $event['topic_data']['topic_poster'], $event['viewtopic_url']);
 		}
diff --git a/qte.php b/qte.php
index c7a348b..081eb53 100644
--- a/qte.php
+++ b/qte.php
@@ -181,7 +181,7 @@ public function attr_select($forum_id, $author_id = 0, $attribute_id = 0, $viewt
 					'S_SELECTED'	=> (!empty($attribute_id) && ($attr['attr_id'] == $attribute_id)) ? true : false,
 					'S_QTE_DESC'	=> !empty($attr['attr_desc']) ? true : false,
 
-					'U_QTE_URL'	=> !empty($viewtopic_url) ? append_sid($viewtopic_url, ['attr_id' => $attr['attr_id']]) : false,
+					'U_QTE_URL'	=> !empty($viewtopic_url) ? append_sid($viewtopic_url, ['attr_id' => $attr['attr_id'], 'hash' => generate_link_hash('qte_attr_apply')]) : false,
 				]);
 			}
 		}
@@ -193,7 +193,7 @@ public function attr_select($forum_id, $author_id = 0, $attribute_id = 0, $viewt
 			'S_QTE_SELECTED'	=> ($s_delete && ($attribute_id == self::DELETE)) ? true : false,
 			'S_QTE_KEEP'		=> !empty($attribute_id) && ($attribute_id == self::KEEP) ? true : false,
 
-			'U_QTE_URL'	=> !empty($viewtopic_url) ? append_sid($viewtopic_url, ['attr_id' => self::DELETE]) : false,
+			'U_QTE_URL'	=> !empty($viewtopic_url) ? append_sid($viewtopic_url, ['attr_id' => self::DELETE, 'hash' => generate_link_hash('qte_attr_apply')]) : false,
 		]);
 	}
 
diff --git a/styles/prosilver/template/event/mcp_forum_actions_before.html b/styles/prosilver/template/event/mcp_forum_actions_before.html
index 122daaf..9fd2d76 100644
--- a/styles/prosilver/template/event/mcp_forum_actions_before.html
+++ b/styles/prosilver/template/event/mcp_forum_actions_before.html
@@ -1,4 +1,5 @@
 {% if S_QTE_SELECT %}
+{{ S_FORM_TOKEN_QTE }}
 <fieldset class="display-actions">
 	<select name="attr_id" id="attribute">
 		<option style="padding-left: 0px; font-weight: bold;" value="0">{{ lang('QTE_ATTRIBUTE_SELECT') }}</option>
diff --git a/styles/prosilver/template/event/viewtopic_dropdown_bottom_custom.html b/styles/prosilver/template/event/viewtopic_dropdown_bottom_custom.html
index 9660e4e..4773121 100644
--- a/styles/prosilver/template/event/viewtopic_dropdown_bottom_custom.html
+++ b/styles/prosilver/template/event/viewtopic_dropdown_bottom_custom.html
@@ -19,4 +19,4 @@
 		</ul>
 	</div>
 </div>
-{% endif %}
\ No newline at end of file
+{% endif %}
diff --git a/tests/unit/event/main_listener_test.php b/tests/unit/event/main_listener_test.php
new file mode 100644
index 0000000..7bd70e5
--- /dev/null
+++ b/tests/unit/event/main_listener_test.php
@@ -0,0 +1,54 @@
+<?php
+/**
+ *
+ * Quick Title Edition extension for the phpBB Forum Software package.
+ *
+ * @copyright (c) 2023, Kailey Snay, https://www.snayhomelab.com/
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ */
+
+namespace kaileymsnay\qte\tests\unit\event;
+
+class main_listener_test extends \phpbb_test_case
+{
+	public function test_viewtopic_get_attribute_without_valid_hash_is_ignored()
+	{
+		global $user;
+		$previous_user = $user ?? null;
+		$user = new \stdClass();
+		$user->data = ['user_form_salt' => 'test-salt'];
+
+		$request = $this->createMock('\phpbb\request\request');
+		$request->expects($this->exactly(2))
+			->method('variable')
+			->willReturnCallback(function($name, $default) {
+				return $name === 'attr_id' ? 1 : 'invalid-hash';
+			});
+
+		$qte = $this->createMock('\kaileymsnay\qte\qte');
+		$qte->expects($this->never())->method('attr_apply');
+
+		$listener = new \kaileymsnay\qte\event\main_listener(
+			$this->createMock('\phpbb\cache\driver\driver_interface'),
+			$this->createMock('\phpbb\db\driver\driver_interface'),
+			$this->createMock('\phpbb\language\language'),
+			$this->createMock('\phpbb\log\log'),
+			$request,
+			$this->createMock('\phpbb\template\template'),
+			$this->createMock('\phpbb\user'),
+			'phpbb_',
+			$qte,
+			$this->createMock('\kaileymsnay\qte\search\fulltext_attribute')
+		);
+
+		try
+		{
+			$listener->viewtopic_add_quickmod_option_before(new \phpbb\event\data([]));
+		}
+		finally
+		{
+			$user = $previous_user;
+		}
+	}
+}