CVE-2019-6339

In Drupal Core versions 7.x prior to 7.62, 8.6.x prior to 8.6.6 and 8.5.x
prior to 8.5.9; A remote code execution vulnerability exists in PHP’s
built-in phar stream wrapper when performing file operations on an
untrusted phar:// URI. Some Drupal code (core, contrib, and custom) may be
performing file operations on insufficiently validated user input, thereby
being exposed to this vulnerability. This vulnerability is mitigated by the
fact that such code paths typically require access to an administrative
permission or an atypical configuration.