CVE-2020-13671: Drupal core Un-restricted Upload of File

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2022-01-18. EPSS: 35.4% chance of exploitation in the next 30 days.

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. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.

Affected products

• Drupal Drupal: from 7.0, before 7.74 (fixed in 7.74); from 8.8.0, before 8.8.11 (fixed in 8.8.11); from 8.9.0, before 8.9.9 (fixed in 8.9.9); from 9.0.0, before 9.0.8 (fixed in 9.0.8)
• Fedoraproject Fedora: version 32 only; version 33 only

Published 2020-11-20. Last modified 2026-06-17.