CVE-2020-13664

Arbitrary PHP code execution vulnerability in Drupal Core under certain circumstances.

An attacker could trick an administrator into visiting a malicious site that could result in creating a carefully named directory on the file system. With this directory in place, an attacker could attempt to brute force a remote code execution vulnerability.

Windows servers are most likely to be affected.

This issue affects:
Drupal Drupal Core
8.8.x versions prior to 8.8.8;
8.9.x versions prior to 8.9.1;
9.0.1 versions prior to 9.0.1.

Source: CVE-2020-13664