diff --git a/build/build.xml b/build/build.xml
index b8a88473ba..b9002f5744 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -3,8 +3,8 @@
 <project name="phpBB" description="The phpBB forum software" default="all" basedir="../">
 	<!-- a few settings for the build -->
 	<property name="newversion" value="3.1.8-dev" />
-	<property name="prevversion" value="3.1.7" />
-	<property name="olderversions" value="3.0.14, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6" />
+	<property name="prevversion" value="3.1.7-pl1" />
+	<property name="olderversions" value="3.0.14, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.1.7-RC1, 3.1.7" />
 	<!-- no configuration should be needed beyond this point -->
 
 	<property name="oldversions" value="${olderversions}, ${prevversion}" />
diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index a59ea31509..97998e7d00 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -49,6 +49,7 @@
 <ol>
 	<li><a href="#changelog">Changelog</a>
 	<ul>
+		<li><a href="#v317">Changes since 3.1.7</a></li>
 		<li><a href="#v316">Changes since 3.1.6</a></li>
 		<li><a href="#v315">Changes since 3.1.5</a></li>
 		<li><a href="#v314">Changes since 3.1.4</a></li>
@@ -114,6 +115,17 @@
 
 		<div class="content">
 
+			<a name="v317"></a><h3>Changes since 3.1.7</h3>
+
+	<h4>Security Issue</h4>
+	<ul>
+		<li>[SECURITY-188] - Check form key in acp_bbcodes</li>
+	</ul>
+	<h4>Bug</h4>
+	<ul>
+		<li>[<a href="https://tracker.phpbb.com/browse/PHPBB3-14343">PHPBB3-14343</a>] - Undefined variable $phpbb_dispatcher when (un-)locking a topic or post</li>
+	</ul>
+
 			<a name="v316"></a><h3>Changes since 3.1.6</h3>
 
 	<h4>Bug</h4>
diff --git a/phpBB/includes/acp/acp_bbcodes.php b/phpBB/includes/acp/acp_bbcodes.php
index e245eea069..35ac33882e 100644
--- a/phpBB/includes/acp/acp_bbcodes.php
+++ b/phpBB/includes/acp/acp_bbcodes.php
@@ -33,6 +33,7 @@ class acp_bbcodes
 		// Set up general vars
 		$action	= request_var('action', '');
 		$bbcode_id = request_var('bbcode', 0);
+		$submit = $request->is_set_post('submit');
 
 		$this->tpl_name = 'acp_bbcodes';
 		$this->page_title = 'ACP_BBCODES';
@@ -40,6 +41,11 @@ class acp_bbcodes
 
 		add_form_key($form_key);
 
+		if ($submit && !check_form_key($form_key))
+		{
+			trigger_error($user->lang['FORM_INVALID'] . adm_back_link($this->u_action), E_USER_WARNING);
+		}
+
 		// Set up mode-specific vars
 		switch ($action)
 		{
diff --git a/phpBB/includes/acp/acp_extensions.php b/phpBB/includes/acp/acp_extensions.php
index a3849d8ba1..23a004fdc1 100644
--- a/phpBB/includes/acp/acp_extensions.php
+++ b/phpBB/includes/acp/acp_extensions.php
@@ -121,8 +121,6 @@ class acp_extensions
 					'U_ACTION' 				=> $this->u_action,
 				));
 
-				add_form_key('version_check_settings');
-
 				$this->tpl_name = 'acp_ext_list';
 			break;
 
diff --git a/phpBB/phpbb/db/migration/data/v31x/v317pl1.php b/phpBB/phpbb/db/migration/data/v31x/v317pl1.php
new file mode 100644
index 0000000000..2e1b0e9b9d
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v31x/v317pl1.php
@@ -0,0 +1,31 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db\migration\data\v31x;
+
+class v317pl1 extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array(
+			'\phpbb\db\migration\data\v31x\v317',
+		);
+	}
+
+	public function update_data()
+	{
+		return array(
+			array('config.update', array('version', '3.1.7-pl1')),
+		);
+	}
+}