diff --git a/wp-includes/version.php b/wp-includes/version.php
index 29e2cadce9..86ef8d43bd 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37242';
+$wp_version = '4.6-alpha-37243';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-login.php b/wp-login.php
index ed3878c293..96eef5b27d 100644
--- a/wp-login.php
+++ b/wp-login.php
@@ -151,6 +151,14 @@ function login_header( $title = 'Log In', $message = '', $wp_error = '' ) {
 	?>
 	</head>
 	<body class="login <?php echo esc_attr( implode( ' ', $classes ) ); ?>">
+	<?php
+	/**
+	 * Fires in the login page header after the body tag is opened.
+	 *
+	 * @since 4.6.0
+	 */
+	do_action( 'login_header' );
+	?>
 	<div id="login">
 		<h1><a href="<?php echo esc_url( $login_header_url ); ?>" title="<?php echo esc_attr( $login_header_title ); ?>" tabindex="-1"><?php bloginfo( 'name' ); ?></a></h1>
 	<?php
