diff --git a/lib/private/Authentication/LoginCredentials/Store.php b/lib/private/Authentication/LoginCredentials/Store.php
index f4bedd88a1..6dd7dc3fb7 100644
--- a/lib/private/Authentication/LoginCredentials/Store.php
+++ b/lib/private/Authentication/LoginCredentials/Store.php
@@ -112,7 +112,7 @@ class Store implements IStore {
 
 		if ($trySession && $this->session->exists('login_credentials')) {
 			$creds = json_decode($this->session->get('login_credentials'));
-			return new Credentials($creds->uid, $creds->uid, $creds->password);
+			return new Credentials($creds->uid, $creds->loginName, $creds->password);
 		}
 
 		// If we reach this line, an exception was thrown.
diff --git a/lib/private/Server.php b/lib/private/Server.php
index 9b452f21ce..ff3214fe03 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -566,9 +566,9 @@ class Server extends ServerContainer implements IServerContainer {
 				$dispatcher = $this->query(IEventDispatcher::class);
 				$dispatcher->dispatchTyped(new BeforeUserLoggedInEvent($uid, $password));
 			});
-			$userSession->listen('\OC\User', 'postLogin', function ($user, $password, $isTokenLogin) {
+			$userSession->listen('\OC\User', 'postLogin', function ($user, $loginName, $password, $isTokenLogin) {
 				/** @var \OC\User\User $user */
-				\OC_Hook::emit('OC_User', 'post_login', ['run' => true, 'uid' => $user->getUID(), 'password' => $password, 'isTokenLogin' => $isTokenLogin]);
+				\OC_Hook::emit('OC_User', 'post_login', ['run' => true, 'uid' => $user->getUID(), 'loginName' => $loginName, 'password' => $password, 'isTokenLogin' => $isTokenLogin]);
 
 				/** @var IEventDispatcher $dispatcher */
 				$dispatcher = $this->query(IEventDispatcher::class);
diff --git a/lib/private/User/Session.php b/lib/private/User/Session.php
index 3996869c69..176e384bcb 100644
--- a/lib/private/User/Session.php
+++ b/lib/private/User/Session.php
@@ -80,7 +80,7 @@ use Symfony\Component\EventDispatcher\GenericEvent;
  * - preUnassignedUserId(string $uid)
  * - postUnassignedUserId(string $uid)
  * - preLogin(string $user, string $password)
- * - postLogin(\OC\User\User $user, string $password)
+ * - postLogin(\OC\User\User $user, string $loginName, string $password, boolean $isTokenLogin)
  * - preRememberedLogin(string $uid)
  * - postRememberedLogin(\OC\User\User $user)
  * - logout()
@@ -400,11 +400,13 @@ class Session implements IUserSession, Emitter {
 
 		$this->dispatcher->dispatchTyped(new PostLoginEvent(
 			$user,
+			$loginDetails['loginName'],
 			$loginDetails['password'],
 			$isToken
 		));
 		$this->manager->emit('\OC\User', 'postLogin', [
 			$user,
+			$loginDetails['loginName'],
 			$loginDetails['password'],
 			$isToken,
 		]);
diff --git a/lib/public/User/Events/PostLoginEvent.php b/lib/public/User/Events/PostLoginEvent.php
index 15772bfef1..76d9a70aac 100644
--- a/lib/public/User/Events/PostLoginEvent.php
+++ b/lib/public/User/Events/PostLoginEvent.php
@@ -38,6 +38,12 @@ class PostLoginEvent extends Event {
 	/** @var IUser */
 	private $user;
 
+	/**
+	 * @since 20.0.0
+	 * @var string
+	 */
+	private $loginName;
+
 	/** @var string */
 	private $password;
 
@@ -47,9 +53,10 @@ class PostLoginEvent extends Event {
 	/**
 	 * @since 18.0.0
 	 */
-	public function __construct(IUser $user, string $password, bool $isTokenLogin) {
+	public function __construct(IUser $user, string $loginName, string $password, bool $isTokenLogin) {
 		parent::__construct();
 		$this->user = $user;
+		$this->loginName = $loginName;
 		$this->password = $password;
 		$this->isTokenLogin = $isTokenLogin;
 	}
@@ -61,6 +68,13 @@ class PostLoginEvent extends Event {
 		return $this->user;
 	}
 
+	/**
+	 * @since 20.0.0
+	 */
+	public function getLoginName(): string {
+		return $this->loginName;
+	}
+
 	/**
 	 * @since 18.0.0
 	 */