diff --git a/lib/horde/framework/Horde/Idna.php b/lib/horde/framework/Horde/Idna.php
index 6b73a066ee1..1380682cbc1 100644
--- a/lib/horde/framework/Horde/Idna.php
+++ b/lib/horde/framework/Horde/Idna.php
@@ -88,6 +88,9 @@ class Horde_Idna
      */
     protected static function _checkForError($info)
     {
+        if (!isset($info['errors'])) {
+            return;
+        }
         switch (true) {
         case $info['errors'] & IDNA_ERROR_EMPTY_LABEL:
             throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
diff --git a/lib/horde/framework/Horde/Imap/Client/Data/Thread.php b/lib/horde/framework/Horde/Imap/Client/Data/Thread.php
index 0970c8ff1ba..0fc857e9c09 100644
--- a/lib/horde/framework/Horde/Imap/Client/Data/Thread.php
+++ b/lib/horde/framework/Horde/Imap/Client/Data/Thread.php
@@ -120,6 +120,53 @@ class Horde_Imap_Client_Data_Thread implements Countable, Serializable
         return array();
     }
 
+    /**
+     * Returns array of all threads.
+     *
+     * @return array  Keys of thread arrays are indices, values are objects with the following
+     *                properties:
+     *   - base: (integer) Base ID of the thread. If null, thread is a single
+     *           message.
+     *   - last: (boolean) If true, this is the last index in the sublevel.
+     *   - level: (integer) The sublevel of the index.
+     */
+    public function getThreads()
+    {
+        $data = array();
+        foreach ($this->_thread as $v) {
+            reset($v);
+
+            $ob = new stdClass;
+            $ob->base = (count($v) > 1) ? key($v) : null;
+            $ob->last = false;
+
+            $levels = $out = array();
+            $last = 0;
+
+            while (($v2 = current($v)) !== false) {
+                $k2 = key($v);
+                $ob2 = clone $ob;
+                $ob2->level = $v2;
+                $out[$k2] = $ob2;
+
+                if (($last < $v2) && isset($levels[$v2])) {
+                    $out[$levels[$v2]]->last = true;
+                }
+                $levels[$v2] = $k2;
+                $last = $v2;
+                next($v);
+            }
+
+            foreach ($levels as $v) {
+                $out[$v]->last = true;
+            }
+
+            $data[] = $out;
+        }
+
+        return $data;
+    }
+
     /* Countable methods. */
 
     /**
diff --git a/lib/horde/framework/Horde/Imap/Client/Search/Query.php b/lib/horde/framework/Horde/Imap/Client/Search/Query.php
index b8c23496b2e..0a4307d3d1a 100644
--- a/lib/horde/framework/Horde/Imap/Client/Search/Query.php
+++ b/lib/horde/framework/Horde/Imap/Client/Search/Query.php
@@ -595,7 +595,7 @@ class Horde_Imap_Client_Search_Query implements Serializable
      * Search for text in either the entire message, or just the body.
      *
      * @param string $text      The search text.
-     * @param string $bodyonly  If true, only search in the body of the
+     * @param boolean $bodyonly  If true, only search in the body of the
      *                          message. If false, also search in the headers.
      * @param boolean $not      If true, do a 'NOT' search of $text.
      * @param array $opts       Additional options:
diff --git a/lib/horde/framework/Horde/Imap/Client/Socket.php b/lib/horde/framework/Horde/Imap/Client/Socket.php
index 240c773d6bb..f9864b0074a 100644
--- a/lib/horde/framework/Horde/Imap/Client/Socket.php
+++ b/lib/horde/framework/Horde/Imap/Client/Socket.php
@@ -1543,12 +1543,9 @@ class Horde_Imap_Client_Socket extends Horde_Imap_Client_Base
 
         /* Add in STATUS return, if needed. */
         if (!empty($options['status']) && $this->_capability('LIST-STATUS')) {
-            foreach ($pattern as $val) {
-                $val_utf8 = Horde_Imap_Client_Utf7imap::Utf7ImapToUtf8($val);
-                if (isset($lr[$val_utf8])) {
-                    $lr[$val_utf8]['status'] = $this->_prepareStatusResponse($status_opts, $val_utf8);
-                }
-            }
+           foreach($lr as $val_utf8 => $tmp) {
+               $lr[$val_utf8]['status'] = $this->_prepareStatusResponse($status_opts, $val_utf8);
+           }
         }
 
         return $lr;
diff --git a/lib/horde/framework/Horde/Imap/Client/Socket/ClientSort.php b/lib/horde/framework/Horde/Imap/Client/Socket/ClientSort.php
index 4030492a8bd..a93853abbeb 100644
--- a/lib/horde/framework/Horde/Imap/Client/Socket/ClientSort.php
+++ b/lib/horde/framework/Horde/Imap/Client/Socket/ClientSort.php
@@ -110,7 +110,7 @@ class Horde_Imap_Client_Socket_ClientSort
         }
 
         $mbox = $this->_socket->currentMailbox();
-        $fetch_res = $this->_socket->fetch($mbox['mailbox'], $query, array(
+        $fetch_res = $this->_socket->fetch(isset($mbox['mailbox']) ? $mbox['mailbox'] : null, $query, array(
             'ids' => $res
         ));
 
diff --git a/lib/horde/framework/Horde/Mime/Mail.php b/lib/horde/framework/Horde/Mime/Mail.php
index 75064b5bf8b..cbec8ea2274 100644
--- a/lib/horde/framework/Horde/Mime/Mail.php
+++ b/lib/horde/framework/Horde/Mime/Mail.php
@@ -394,10 +394,10 @@ class Horde_Mime_Mail
     /**
      * Sends this message.
      *
-     * @param Mail $mailer     A Mail object.
-     * @param boolean $resend  If true, the message id and date are re-used;
-     *                         If false, they will be updated.
-     * @param boolean $flowed  Send message in flowed text format.
+     * @param Horde_Mail_Transport $mailer A Horde_Mail_Transport object.
+     * @param boolean $resend              If true, the message id and date are re-used;
+     *                                     If false, they will be updated.
+     * @param boolean $flowed              Send message in flowed text format.
      *
      * @throws Horde_Mime_Exception
      */
@@ -488,7 +488,7 @@ class Horde_Mime_Mail
      * @param  boolean $stream  If true, return a stream resource, otherwise
      *                          a string is returned.
      *
-     * @return stream|string  The raw email data.
+     * @return resource|string  The raw email data.
      * @since 2.4.0
      */
     public function getRaw($stream = true)
diff --git a/lib/horde/framework/Horde/Socket/Client.php b/lib/horde/framework/Horde/Socket/Client.php
index a7fde63a676..a38d2233b2e 100644
--- a/lib/horde/framework/Horde/Socket/Client.php
+++ b/lib/horde/framework/Horde/Socket/Client.php
@@ -91,7 +91,7 @@ class Client
             $secure = false;
         }
 
-        $context = array_merge_recursive(
+        $context = array_replace_recursive(
             array(
                 'ssl' => array(
                     'verify_peer' => false,
diff --git a/lib/horde/framework/Horde/Util.php b/lib/horde/framework/Horde/Util.php
index 4d16bb86916..d6d111d47be 100644
--- a/lib/horde/framework/Horde/Util.php
+++ b/lib/horde/framework/Horde/Util.php
@@ -114,7 +114,7 @@ class Horde_Util
     public static function dispelMagicQuotes($var)
     {
         if (is_null(self::$_magicquotes)) {
-            self::$_magicquotes = get_magic_quotes_gpc();
+            self::$_magicquotes = function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc();
         }
 
         if (self::$_magicquotes) {
@@ -304,7 +304,7 @@ class Horde_Util
         /* Get the first 8 characters of a random string to use as a temporary
            directory name. */
         do {
-            $new_dir = $temp_dir . '/' . substr(base_convert(uniqid(mt_rand()), 10, 36), 0, 8);
+            $new_dir = $temp_dir . '/' . substr(base_convert(uniqid(mt_rand()), 16, 36), 0, 8);
         } while (file_exists($new_dir));
 
         $old_umask = umask(0000);
diff --git a/lib/horde/readme_moodle.txt b/lib/horde/readme_moodle.txt
index c31e9808f95..d4bcaa61718 100644
--- a/lib/horde/readme_moodle.txt
+++ b/lib/horde/readme_moodle.txt
@@ -12,10 +12,6 @@ Description of import of Horde libraries
 # Copy the following script and store it on /tmp, change it's execute bit(chmod 777), and run it,
   passing in your path to Horde (the directory you've cloned the repository):
     /tmp/copyhorde.sh ~/git/base/directory/from/step/2
-# Verify that these patches have been applied in the imported version. Apply them locally if not:
-    - https://github.com/horde/Mail/pull/1 (Mail component).
-    - https://github.com/horde/Imap_Client/pull/6 (IMAP Client component).
-    - https://github.com/horde/Crypt_Blowfish/pull/1 (PHP 7.4 compatibility, Crypt_Blowfish)
 
 ====
 #!/bin/sh
diff --git a/lib/thirdpartylibs.xml b/lib/thirdpartylibs.xml
index 32ca880ea1d..1e638891013 100644
--- a/lib/thirdpartylibs.xml
+++ b/lib/thirdpartylibs.xml
@@ -179,7 +179,7 @@
     <location>horde</location>
     <name>Horde</name>
     <license>LGPL/BSD</license>
-    <version>5.2.22</version>
+    <version>5.2.23</version>
     <licenseversion>2.1</licenseversion>
   </library>
   <library>
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 9f0d6165360..499aedabe96 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -2,6 +2,7 @@ This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
 === 3.11 ===
+* The horde library has been updated to version 5.2.23.
 * New optional parameter $extracontent for print_collapsible_region_start(). This allows developers to add interactive HTML elements
   (e.g. a help icon) after the collapsible region's toggle link.
 * Final deprecation i_dock_block() in behat_deprecated.php