It was discovered that Drupal did not properly process certain input. An attacker could use this vulnerability to execute arbitrary code or completely compromise a Drupal site. (CVE-2018-7600, CVE-2018-7602)
It was discovered that password reset URLs in Drupal could be forged. An attacker could use this vulnerability to gain access to another user's account. This issue affected only Ubuntu 14.04 ESM. (CVE-2015-2559)
It was discovered that Drupal did not properly protect against open redirects. An attacker could use this vulnerability to send unsuspecting users to 3rd party sites and potentially carry out phishing attacks. This issue affected only Ubuntu 14.04 ESM. (CVE-2015-2749, CVE-2015-2750)