Package Instance

Drupal Core Improperly Controlled Modification of Dynamically-Determined Object Attributes Vulnerability
Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection.This issue affects Drupal core: from 8.0.0 before 10.3.13, from 10.4.0 before 10.4.3, from 11.0.0 before 11.0.12, from 11.1.0 before 11.1.3.

Exposure of Resource to Wrong Sphere
Information Disclosure vulnerability in file module of Drupal Core allows an attacker to gain access to the file metadata of a permanent private file that they do not have access to by guessing the ID of the file. This issue affects: Drupal Core 8.8.x versions prior to 8.8.10; 8.9.x versions prior to 8.9.6; 9.0.x versions prior to 9.0.6.

Drupal core unrestricted file upload
Drupal 8 core's file_save_upload() function does not strip the leading and trailing dot ('.') from filenames, like Drupal 7 did.

Users with the ability to upload files with any extension in conjunction with contributed modules may be able to use this to upload system files such as .htaccess in order to bypass protections afforded by Drupal's default .htaccess file.

After this fix, file_save_upload() now trims leading and trailing dots from filenames.

Improper Access Control
Under certain circumstances, the Drupal core form API evaluates form element access incorrectly. This may lead to a user being able to alter data they should not have access to. No forms provided by Drupal core are known to be vulnerable. However, forms added through contributed or custom modules or themes may be affected.

Drupal Full Path Disclosure
`core/authorize.php` in Drupal 11.x-dev allows Full Path Disclosure (even when error logging is None) if the value of `hash_salt` is `file_get_contents` of a file that does not exist.

Drupal core Access bypass
The Media Library module has a security vulnerability whereby it doesn't sufficiently restrict access to media items in certain configurations.

Solution:
If you are using Drupal 8.7.x, you should upgrade to Drupal 8.7.11.
If you are using Drupal 8.8.x, you should upgrade to Drupal 8.8.1.
Versions of Drupal 8 prior to 8.7.x are end-of-life and do not receive security coverage.

Alternatively, you may mitigate this vulnerability by unchecking the "Enable advanced UI" checkbox on `/admin/config/media/media-library`. (This mitigation is not available in 8.7.x.)