Sanitize meta key before checking protection status

Meta key wasn't sanitized before determining if it's considered protected. This vulnerability affects the following application versions: WordPress 3.6 WordPress 3.6.1 WordPress 3.7 WordPress 3.7.1 WordPress 3.7.2 WordPress 3.7.3 WordPress 3.7.4 WordPress 3.7.5 WordPress 3.7.6 WordPress 3.7.7 WordPress 3.7.8 WordPress 3.7.9 WordPress 3.7.10... Weiterlesen: Sanitize meta key before checking protection status