Improper File Validation in Drupal core JSON:API and REST File Uploads

The JSON:API and REST modules validate uploaded files to image fields by file extension only, not by MIME type or image content. An authenticated attacker with permission to upload to an image field can therefore upload a non-image file. Depending on web-server configuration the file may be served with its real MIME type, enabling cross-site scripting or other unintended outcomes.

This vulnerability affects the following application versions:

• Drupal 10.3.0
• Drupal 10.3.1
• Drupal 10.3.2
• Drupal 10.3.3
• Drupal 10.3.4
• Drupal 10.3.5
• Drupal 10.3.6
• Drupal 10.3.7
• Drupal 10.3.8
• Drupal 10.3.9
• Drupal 10.3.10
• Drupal 10.3.11
• Drupal 10.3.12
• Drupal 10.3.13
• Drupal 10.3.14
• Drupal 10.4.0
• Drupal 10.4.1
• Drupal 10.4.2
• Drupal 10.4.3
• Drupal 10.4.4
• Drupal 10.4.5
• Drupal 10.4.6
• Drupal 10.4.7
• Drupal 10.4.8
• Drupal 10.4.9
• Drupal 10.4.10
• Drupal 10.5.0
• Drupal 10.5.1
• Drupal 10.5.2
• Drupal 10.5.3
• Drupal 10.5.4
• Drupal 10.5.5
• Drupal 10.5.6
• Drupal 10.5.7
• Drupal 10.5.8
• Drupal 10.5.9
• Drupal 10.5.10
• Drupal 10.5.11
• Drupal 10.6.0
• Drupal 10.6.1
• Drupal 10.6.2
• Drupal 10.6.3
• Drupal 10.6.4
• Drupal 10.6.5
• Drupal 10.6.6
• Drupal 10.6.7
• Drupal 10.6.8
• Drupal 10.6.9
• Drupal 10.6.10
• Drupal 11.0.0
• Drupal 11.0.1
• Drupal 11.0.2
• Drupal 11.0.3
• Drupal 11.0.4
• Drupal 11.0.5
• Drupal 11.0.6
• Drupal 11.0.7
• Drupal 11.0.8
• Drupal 11.0.9
• Drupal 11.0.10
• Drupal 11.0.11
• Drupal 11.0.12
• Drupal 11.0.13
• Drupal 11.1.0
• Drupal 11.1.1
• Drupal 11.1.2
• Drupal 11.1.3
• Drupal 11.1.4
• Drupal 11.1.5
• Drupal 11.1.6
• Drupal 11.1.7
• Drupal 11.1.8
• Drupal 11.1.9
• Drupal 11.1.10
• Drupal 11.2.0
• Drupal 11.2.1
• Drupal 11.2.2
• Drupal 11.2.3
• Drupal 11.2.4
• Drupal 11.2.5
• Drupal 11.2.6
• Drupal 11.2.7
• Drupal 11.2.8
• Drupal 11.2.9
• Drupal 11.2.10
• Drupal 11.2.11
• Drupal 11.2.12
• Drupal 11.2.13
• Drupal 11.3.0
• Drupal 11.3.1
• Drupal 11.3.2
• Drupal 11.3.3
• Drupal 11.3.4
• Drupal 11.3.5
• Drupal 11.3.6
• Drupal 11.3.7
• Drupal 11.3.8
• Drupal 11.3.9
• Drupal 11.3.10
• Drupal 11.3.11