diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 1cfc6dac8a5..552dbde9c0e 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,4 +1,8 @@
 
+Drupal 7.52, 2016-11-16
+-----------------------
+- Fixed security issues (multiple vulnerabilities). See SA-CORE-2016-005.
+
 Drupal 7.51, 2016-10-05
 -----------------------
 - The Update module now also checks for updates to a disabled theme that is
diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 0d2e19c0cea..b15b350892f 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -8,7 +8,7 @@
 /**
  * The current system version.
  */
-define('VERSION', '7.51');
+define('VERSION', '7.52');
 
 /**
  * Core API compatibility.
diff --git a/includes/database/select.inc b/includes/database/select.inc
index 3abd205c9ea..8d84460e839 100644
--- a/includes/database/select.inc
+++ b/includes/database/select.inc
@@ -1231,6 +1231,21 @@ class SelectQuery extends Query implements SelectQueryInterface {
 
     // Modules may alter all queries or only those having a particular tag.
     if (isset($this->alterTags)) {
+      // Many contrib modules assume that query tags used for access-checking
+      // purposes follow the pattern $entity_type . '_access'. But this is
+      // not the case for taxonomy terms, since core used to add term_access
+      // instead of taxonomy_term_access to its queries. Provide backwards
+      // compatibility by adding both tags here instead of attempting to fix
+      // all contrib modules in a coordinated effort.
+      // TODO:
+      // - Extract this mechanism into a hook as part of a public (non-security)
+      //   issue.
+      // - Emit E_USER_DEPRECATED if term_access is used.
+      //   https://www.drupal.org/node/2575081
+      $term_access_tags = array('term_access' => 1, 'taxonomy_term_access' => 1);
+      if (array_intersect_key($this->alterTags, $term_access_tags)) {
+        $this->alterTags += $term_access_tags;
+      }
       $hooks = array('query');
       foreach ($this->alterTags as $tag => $value) {
         $hooks[] = 'query_' . $tag;
diff --git a/modules/simpletest/tests/taxonomy_test.module b/modules/simpletest/tests/taxonomy_test.module
index f82950c3026..f4144380135 100644
--- a/modules/simpletest/tests/taxonomy_test.module
+++ b/modules/simpletest/tests/taxonomy_test.module
@@ -109,3 +109,33 @@ function taxonomy_test_get_antonym($tid) {
     ->execute()
     ->fetchField();
 }
+
+/**
+ * Implements hook_query_alter().
+ */
+function taxonomy_test_query_alter(QueryAlterableInterface $query) {
+  $value = variable_get(__FUNCTION__);
+  if (isset($value)) {
+    variable_set(__FUNCTION__, ++$value);
+  }
+}
+
+/**
+ * Implements hook_query_TAG_alter().
+ */
+function taxonomy_test_query_term_access_alter(QueryAlterableInterface $query) {
+  $value = variable_get(__FUNCTION__);
+  if (isset($value)) {
+    variable_set(__FUNCTION__, ++$value);
+  }
+}
+
+/**
+ * Implements hook_query_TAG_alter().
+ */
+function taxonomy_test_query_taxonomy_term_access_alter(QueryAlterableInterface $query) {
+  $value = variable_get(__FUNCTION__);
+  if (isset($value)) {
+    variable_set(__FUNCTION__, ++$value);
+  }
+}
diff --git a/modules/system/system.module b/modules/system/system.module
index 59087c88485..ae7c432342d 100644
--- a/modules/system/system.module
+++ b/modules/system/system.module
@@ -2883,7 +2883,7 @@ function confirm_form($form, $question, $path, $description = NULL, $yes = NULL,
 
   // Prepare cancel link.
   if (isset($_GET['destination'])) {
-    $options = drupal_parse_url(urldecode($_GET['destination']));
+    $options = drupal_parse_url($_GET['destination']);
   }
   elseif (is_array($path)) {
     $options = $path;
diff --git a/modules/taxonomy/taxonomy.module b/modules/taxonomy/taxonomy.module
index 554d6d2ab91..981649d2aca 100644
--- a/modules/taxonomy/taxonomy.module
+++ b/modules/taxonomy/taxonomy.module
@@ -1023,7 +1023,7 @@ function taxonomy_get_parents($tid) {
     $query->join('taxonomy_term_hierarchy', 'h', 'h.parent = t.tid');
     $query->addField('t', 'tid');
     $query->condition('h.tid', $tid);
-    $query->addTag('term_access');
+    $query->addTag('taxonomy_term_access');
     $query->orderBy('t.weight');
     $query->orderBy('t.name');
     $tids = $query->execute()->fetchCol();
@@ -1081,7 +1081,7 @@ function taxonomy_get_children($tid, $vid = 0) {
     if ($vid) {
       $query->condition('t.vid', $vid);
     }
-    $query->addTag('term_access');
+    $query->addTag('taxonomy_term_access');
     $query->orderBy('t.weight');
     $query->orderBy('t.name');
     $tids = $query->execute()->fetchCol();
@@ -1129,7 +1129,7 @@ function taxonomy_get_tree($vid, $parent = 0, $max_depth = NULL, $load_entities
     $query->join('taxonomy_term_hierarchy', 'h', 'h.tid = t.tid');
     $result = $query
       ->addTag('translatable')
-      ->addTag('term_access')
+      ->addTag('taxonomy_term_access')
       ->fields('t')
       ->fields('h', array('parent'))
       ->condition('t.vid', $vid)
@@ -1249,7 +1249,7 @@ class TaxonomyTermController extends DrupalDefaultEntityController {
   protected function buildQuery($ids, $conditions = array(), $revision_id = FALSE) {
     $query = parent::buildQuery($ids, $conditions, $revision_id);
     $query->addTag('translatable');
-    $query->addTag('term_access');
+    $query->addTag('taxonomy_term_access');
     // When name is passed as a condition use LIKE.
     if (isset($conditions['name'])) {
       $query_conditions = &$query->conditions();
diff --git a/modules/taxonomy/taxonomy.pages.inc b/modules/taxonomy/taxonomy.pages.inc
index 975ff1203a6..38b24b3b43d 100644
--- a/modules/taxonomy/taxonomy.pages.inc
+++ b/modules/taxonomy/taxonomy.pages.inc
@@ -150,7 +150,7 @@ function taxonomy_autocomplete($field_name = '', $tags_typed = '') {
 
     $query = db_select('taxonomy_term_data', 't');
     $query->addTag('translatable');
-    $query->addTag('term_access');
+    $query->addTag('taxonomy_term_access');
 
     // Do not select already entered terms.
     if (!empty($tags_typed)) {
diff --git a/modules/taxonomy/taxonomy.test b/modules/taxonomy/taxonomy.test
index e9dac1ec979..a4b7ee833e3 100644
--- a/modules/taxonomy/taxonomy.test
+++ b/modules/taxonomy/taxonomy.test
@@ -1983,3 +1983,113 @@ class TaxonomyEFQTestCase extends TaxonomyWebTestCase {
   }
 
 }
+
+/**
+ * Tests that appropriate query tags are added.
+ */
+class TaxonomyQueryAlterTestCase extends TaxonomyWebTestCase {
+  public static function getInfo() {
+    return array(
+      'name' => 'Taxonomy query tags',
+      'description' => 'Verifies that taxonomy_term_access tags are added to queries.',
+      'group' => 'Taxonomy',
+    );
+  }
+
+  public function setUp() {
+    parent::setUp('taxonomy_test');
+  }
+
+  /**
+   * Tests that appropriate tags are added when querying the database.
+   */
+  public function testTaxonomyQueryAlter() {
+    // Create a new vocabulary and add a few terms to it.
+    $vocabulary = $this->createVocabulary();
+    $terms = array();
+    for ($i = 0; $i < 5; $i++) {
+      $terms[$i] = $this->createTerm($vocabulary);
+    }
+
+    // Set up hierarchy. Term 2 is a child of 1.
+    $terms[2]->parent = array($terms[1]->tid);
+    taxonomy_term_save($terms[2]);
+
+    $this->setupQueryTagTestHooks();
+    $loaded_term = taxonomy_term_load($terms[0]->tid);
+    $this->assertEqual($loaded_term->tid, $terms[0]->tid, 'First term was loaded');
+    $this->assertQueryTagTestResult(1, 'taxonomy_term_load()');
+
+    $this->setupQueryTagTestHooks();
+    $loaded_terms = taxonomy_get_tree($vocabulary->vid);
+    $this->assertEqual(count($loaded_terms), count($terms), 'All terms were loaded');
+    $this->assertQueryTagTestResult(1, 'taxonomy_get_tree()');
+
+    $this->setupQueryTagTestHooks();
+    $loaded_terms = taxonomy_get_parents($terms[2]->tid);
+    $this->assertEqual(count($loaded_terms), 1, 'All parent terms were loaded');
+    $this->assertQueryTagTestResult(2, 'taxonomy_get_parents()');
+
+    $this->setupQueryTagTestHooks();
+    $loaded_terms = taxonomy_get_children($terms[1]->tid);
+    $this->assertEqual(count($loaded_terms), 1, 'All child terms were loaded');
+    $this->assertQueryTagTestResult(2, 'taxonomy_get_children()');
+
+    $this->setupQueryTagTestHooks();
+    $query = db_select('taxonomy_term_data', 't');
+    $query->addField('t', 'tid');
+    $query->addTag('taxonomy_term_access');
+    $tids = $query->execute()->fetchCol();
+    $this->assertEqual(count($tids), count($terms), 'All term IDs were retrieved');
+    $this->assertQueryTagTestResult(1, 'custom db_select() with taxonomy_term_access tag (preferred)');
+
+    $this->setupQueryTagTestHooks();
+    $query = db_select('taxonomy_term_data', 't');
+    $query->addField('t', 'tid');
+    $query->addTag('term_access');
+    $tids = $query->execute()->fetchCol();
+    $this->assertEqual(count($tids), count($terms), 'All term IDs were retrieved');
+    $this->assertQueryTagTestResult(1, 'custom db_select() with term_access tag (deprecated)');
+
+    $this->setupQueryTagTestHooks();
+    $query = new EntityFieldQuery();
+    $query->entityCondition('entity_type', 'taxonomy_term');
+    $query->addTag('taxonomy_term_access');
+    $result = $query->execute();
+    $this->assertEqual(count($result['taxonomy_term']), count($terms), 'All term IDs were retrieved');
+    $this->assertQueryTagTestResult(1, 'custom EntityFieldQuery with taxonomy_term_access tag (preferred)');
+
+    $this->setupQueryTagTestHooks();
+    $query = new EntityFieldQuery();
+    $query->entityCondition('entity_type', 'taxonomy_term');
+    $query->addTag('term_access');
+    $result = $query->execute();
+    $this->assertEqual(count($result['taxonomy_term']), count($terms), 'All term IDs were retrieved');
+    $this->assertQueryTagTestResult(1, 'custom EntityFieldQuery with term_access tag (deprecated)');
+  }
+
+  /**
+   * Sets up the hooks in the test module.
+   */
+  protected function setupQueryTagTestHooks() {
+    taxonomy_terms_static_reset();
+    variable_set('taxonomy_test_query_alter', 0);
+    variable_set('taxonomy_test_query_term_access_alter', 0);
+    variable_set('taxonomy_test_query_taxonomy_term_access_alter', 0);
+  }
+
+  /**
+   * Verifies invocation of the hooks in the test module.
+   *
+   * @param int $expected_invocations
+   *   The number of times the hooks are expected to have been invoked.
+   * @param string $method
+   *   A string describing the invoked function which generated the query.
+   */
+  protected function assertQueryTagTestResult($expected_invocations, $method) {
+    $this->assertIdentical($expected_invocations, variable_get('taxonomy_test_query_alter'), 'hook_query_alter() invoked when executing ' . $method);
+    $this->assertIdentical($expected_invocations, variable_get('taxonomy_test_query_term_access_alter'), 'Deprecated hook_query_term_access_alter() invoked when executing ' . $method);
+    $this->assertIdentical($expected_invocations, variable_get('taxonomy_test_query_taxonomy_term_access_alter'), 'Preferred hook_query_taxonomy_term_access_alter() invoked when executing ' . $method);
+  }
+
+}