CVE-2013-6386: Drupal

Medium severity, CVSS 6.8. EPSS: 2.1% chance of exploitation in the next 30 days.

Drupal 6.x before 6.29 and 7.x before 7.24 uses the PHP mt_rand function to generate random numbers, which uses predictable seeds and allows remote attackers to predict security strings and bypass intended restrictions via a brute force attack.

Affected products

• Drupal Drupal: version 7.0 only; version 7.1 only; version 7.2 only; version 7.3 only; version 7.4 only; version 7.5 only; …

Published 2013-12-07. Last modified 2026-06-17.