diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index 6386c95f62..775f2a11fc 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -1280,6 +1280,9 @@ if ( ! function_exists( 'wp_sanitize_redirect' ) ) :
 	 * @return string Redirect-sanitized URL.
 	 */
 	function wp_sanitize_redirect( $location ) {
+		// Encode spaces.
+		$location = str_replace( ' ', '%20', $location );
+
 		$regex    = '/
 		(
 			(?: [\xC2-\xDF][\x80-\xBF]        # double-byte sequences   110xxxxx 10xxxxxx
@@ -1296,7 +1299,7 @@ if ( ! function_exists( 'wp_sanitize_redirect' ) ) :
 		$location = preg_replace( '|[^a-z0-9-~+_.?#=&;,/:%!*\[\]()@]|i', '', $location );
 		$location = wp_kses_no_null( $location );
 
-		// remove %0d and %0a from location
+		// Remove %0D and %0A from location.
 		$strip = array( '%0d', '%0a', '%0D', '%0A' );
 		return _deep_replace( $strip, $location );
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9b02e63fb0..61fb8497a8 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-beta3-46461';
+$wp_version = '5.3-beta3-46462';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.