diff --git a/wp-includes/user.php b/wp-includes/user.php
index f60dbe5d3f..6222e932a9 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -48,10 +48,10 @@ function wp_signon( $credentials = array(), $secure_cookie = '' ) {
 			'remember'      => false,
 		);
 
-		if ( ! empty( $_POST['log'] ) ) {
+		if ( ! empty( $_POST['log'] ) && is_string( $_POST['log'] ) ) {
 			$credentials['user_login'] = wp_unslash( $_POST['log'] );
 		}
-		if ( ! empty( $_POST['pwd'] ) ) {
+		if ( ! empty( $_POST['pwd'] ) && is_string( $_POST['pwd'] ) ) {
 			$credentials['user_password'] = $_POST['pwd'];
 		}
 		if ( ! empty( $_POST['rememberme'] ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 30b5520349..e04ca9d679 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59594';
+$wp_version = '6.8-alpha-59595';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.