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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-13670
• https://www.drupal.org/sa-core-2020-011
• drupal/core@f93a37b
• https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2020-13670.yaml
• https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2020-13670.yaml