CVE-2020-13665: Drupal

Critical severity, CVSS 9.8. EPSS: 1.3% chance of exploitation in the next 30 days.

Access bypass vulnerability in Drupal Core allows JSON:API when JSON:API is in read/write mode. Only sites that have the read_only set to FALSE under jsonapi.settings config are vulnerable. This issue affects: Drupal Drupal Core 8.8.x versions prior to 8.8.8; 8.9.x versions prior to 8.9.1; 9.0.x versions prior to 9.0.1.

Affected products

• Drupal Drupal: from 8.8.0, before 8.8.8 (fixed in 8.8.8); from 8.9.0, before 8.9.1 (fixed in 8.9.1); from 9.0.0, before 9.0.1 (fixed in 9.0.1)

Published 2021-05-05. Last modified 2026-06-17.