Package Instance

Moderately critical - Third-party libraries - SA-CORE-2019-007
The `PharStreamWrapper` (aka `phar-stream-wrapper`) package does not prevent directory traversal, which allows attackers to bypass a deserialization protection mechanism, as demonstrated by a `phar:///path/bad.phar/../good.phar` URL.

Improper Input Validation
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.

Files uploaded by anonymous users accessed by other users
Private files that have been uploaded by an anonymous user but not permanently attached to content on the site should only be visible to the anonymous user that uploaded them, rather than all anonymous users. Drupal core does not provide this protection, allowing an access bypass vulnerability to occur. This issue is mitigated by the fact that in order to be affected, the site must allow anonymous users to upload files into a private file system.

Cross-site Scripting
The jQuery library, which is included in rdoc, mishandles `jQuery.extend(true, {}, ...)` because of Object.prototype pollution. If an unsanitized source object contained an enumerable `__proto__` property, it could extend the native `Object.prototype.`