Ticket #39778: 39778.diff

src/wp-includes/class-wp-customize-manager.php

@@ -480 +480 @@
                         return;
                 }
 
-                if ( ! preg_match( '/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/', $this->_changeset_uuid ) ) {
+                if ( ! wp_is_valid_uuid4( $this->_changeset_uuid ) ) {
                         $this->wp_die( -1, __( 'Invalid changeset UUID' ) );
                 }
 

src/wp-includes/functions.php

@@ -5610 +5610 @@
 }
 
 /**
+ * Generate a random UUID (version 4).
+ *
+ * @param string $uuid
+ *
+ * @return bool The string is a valid UUID V4 or false on failure.
+ */
+function wp_is_valid_uuid4( $uuid ) {
+        return preg_match( '/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/', $uuid );
+}
+
+/**
  * Get last changed date for the specified cache group.
  *
  * @since 4.7.0