Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations.
- Drupal: 9.0
- Drupal: 8.9
- Drupal: 8.8.x
- Drupal: 7
it’s recommended that you audit all previously uploaded files to check for malicious extensions. Look specifically for files that include more than one extension, like
filename.html.gif, without an underscore (
_) in the extension. Pay specific attention to the following file extensions, which should be considered dangerous even when followed by one or more additional extensions:
This list is not exhaustive, so evaluate security concerns for other unmunged extensions on a case-by-case basis.
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