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This vulnerability may lead to information disclosure, remote code execution, and privilege escalation.
What is Vulnerable:
Drupal 8.9.0
Drupal 9.0.x
Drupal 10.4.9, 10.5.0 - 10.5.9, 10.6.0 -10.6.8
Drupal 11.0.0 - 11.1.9, 11.2.0,11.3.0 - 11.3.9
Not Vulnerable:
Drupal sites that are not using PostgreSQL databases.
Drupal 7.x is not affected as far as we know. Any Drupal 7 Sites hosted on Pantheon, including open Berkeley Platform sites, are automatically eligible for extended security support.
Recommendations
Install the latest patched version:
For Drupal 8.9.0, manually apply the Drupal 8.9 patch
For Drupal 9.0.x, manually apply the Drupal 9.5 patch
For Drupal 10.4.9, update to Drupal 10.4.10
For Drupal 10.5.0-10.5.9, update to Drupal 10.5.10
For Drupal 10.6.0-10.6.8, update to Drupal 10.6.9
For Drupal 11.0.0 - 11.0.9, update to Drupal 11.1.10
For Drupal 11.2.0, update to Drupal 11.2.12
For Drupal 11.3.0-11.3.9, update to Drupal 11.3.10
Sites hosted on Pantheon should apply the appropriate update as soon as possible. Contact the Web Platform Services team if you run a site on Pantheon if you need further clarification or assistance.