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Project: 
Drupal core
Date: 
2022-September-28
Security risk: 
Critical 18∕25 AC:Basic/A:Admin/CI:All/II:All/E:Proof/TD:All
Vulnerability: 
Multiple vulnerabilities
Affected versions: 
>= 8.0.0 <9.3.22 || >= 9.4.0 <9.4.7
CVE IDs: 
CVE-2022-39261
Description: 

Drupal uses the Twig third-party library for content templating and sanitization. Twig has released a security update that affects Drupal. Twig has rated the vulnerability as high severity.

Drupal core’s code extending Twig has also been updated to mitigate a related vulnerability.

Multiple vulnerabilities are possible if an untrusted user has access to write Twig code, including potential unauthorized read access to private files, the contents of other files on the server, or database credentials.

The vulnerability is mitigated by the fact that an exploit is only possible in Drupal core with a restricted access administrative permission. Additional exploit paths for the same vulnerability may exist with contributed or custom code that allows users to write Twig templates.

Solution: 

Install the latest version:

If you are using Drupal 9.4, update to Drupal 9.4.7.

If you are using Drupal 9.3, update to Drupal 9.3.22.

All versions of Drupal 9 prior to 9.3.x are end-of-life and do not receive security coverage. Note that Drupal 8 has reached its end of life.

Drupal 7 core does not include Twig and therefore is not affected.

Reported By: 
Fabien Potencier
Nicolas Grekas
James Williams
Fixed By: 
xjm of the Drupal Security Team
Alex Pott of the Drupal Security Team
Sascha Grossenbacher
Lee Rowlands of the Drupal Security Team
Lauri Eskola, provisional member of the Drupal Security Team
Nathaniel Catchpole of the Drupal Security Team
Dave Long, provisional member of the Drupal Security Team
cilefen of the Drupal Security Team
James Williams
Benji Fisher, provisional member of the Drupal Security Team

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