diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45b2a6db5..79cb95da1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 1. [](#improved)
    * Updated `bin/composer.phar` to latest `2.4.4` version [#3627](https://github.com/getgrav/grav/issues/3627)
 1. [](#bugfix)
-   * Get around a bug where messages were not always being set on session during redirect
+   * New `onBeforeSessionStart()` event to be used to store data lost during session regeneration (e.g. login)
    * Don't fail hard if pages recurse with same path
    * Github workflows security hardening [#3624](https://github.com/getgrav/grav/pull/3624)
 
diff --git a/system/src/Grav/Common/Grav.php b/system/src/Grav/Common/Grav.php
index c3d570c3e..d2fce7351 100644
--- a/system/src/Grav/Common/Grav.php
+++ b/system/src/Grav/Common/Grav.php
@@ -439,12 +439,6 @@ class Grav extends Container
     {
         $response = $this->getRedirectResponse($route, $code);
 
-        $session = $this['session'] ?? null;
-        $messages = $this['messages'] ?? null;
-        if (!isset($session->messages) && $session && $messages) {
-            $session->messages = $messages;
-        }
-
         $this->close($response);
     }
 
diff --git a/system/src/Grav/Common/Session.php b/system/src/Grav/Common/Session.php
index 513143e09..6dbee000a 100644
--- a/system/src/Grav/Common/Session.php
+++ b/system/src/Grav/Common/Session.php
@@ -10,6 +10,7 @@
 namespace Grav\Common;
 
 use Grav\Common\Form\FormFlash;
+use Grav\Events\BeforeSessionStartEvent;
 use Grav\Events\SessionStartEvent;
 use Grav\Plugin\Form\Forms;
 use JsonException;
@@ -177,6 +178,17 @@ class Session extends \Grav\Framework\Session\Session
         return null;
     }
 
+    /**
+     * @return void
+     */
+    protected function onBeforeSessionStart(): void
+    {
+        $event = new BeforeSessionStartEvent($this);
+
+        $grav = Grav::instance();
+        $grav->dispatchEvent($event);
+    }
+
     /**
      * @return void
      */
diff --git a/system/src/Grav/Events/BeforeSessionStartEvent.php b/system/src/Grav/Events/BeforeSessionStartEvent.php
new file mode 100644
index 000000000..fc78304bf
--- /dev/null
+++ b/system/src/Grav/Events/BeforeSessionStartEvent.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * @package    Grav\Events
+ *
+ * @copyright  Copyright (c) 2015 - 2022 Trilby Media, LLC. All rights reserved.
+ * @license    MIT License; see LICENSE file for details.
+ */
+
+namespace Grav\Events;
+
+use Grav\Framework\Session\SessionInterface;
+use Symfony\Contracts\EventDispatcher\Event;
+
+/**
+ * Plugins Loaded Event
+ *
+ * This event is called from $grav['session']->start() right before session_start() call.
+ *
+ * @property SessionInterface $session Session instance.
+ */
+class BeforeSessionStartEvent extends Event
+{
+    /** @var SessionInterface */
+    public $session;
+
+    public function __construct(SessionInterface $session)
+    {
+        $this->session = $session;
+    }
+
+    public function __debugInfo(): array
+    {
+        return (array)$this;
+    }
+}
diff --git a/system/src/Grav/Framework/Session/Session.php b/system/src/Grav/Framework/Session/Session.php
index 108563e37..d1ca7e2ad 100644
--- a/system/src/Grav/Framework/Session/Session.php
+++ b/system/src/Grav/Framework/Session/Session.php
@@ -317,6 +317,8 @@ class Session implements SessionInterface
 
             $this->removeCookie();
 
+            $this->onBeforeSessionStart();
+
             $success = @session_start($this->options);
             if (!$success) {
                 $last = error_get_last();
@@ -456,6 +458,10 @@ class Session implements SessionInterface
         return \PHP_SAPI !== 'cli' ? \PHP_SESSION_ACTIVE === session_status() : false;
     }
 
+    protected function onBeforeSessionStart(): void
+    {
+    }
+
     protected function onSessionStart(): void
     {
     }