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Vulnerability of Drupal Subgroup: privilege escalation via Uncle/Cousin Tree

Synthesis of the vulnerability 

An attacker can bypass restrictions via Uncle/Cousin Tree of Drupal Subgroup, in order to escalate his privileges.
Vulnerable systems: Drupal Modules ~ not comprehensive.
Severity of this threat: 2/4.
Creation date: 27/01/2021.
Références of this weakness: DRUPAL-SA-CONTRIB-2021-003, VIGILANCE-VUL-34424.

Description of the vulnerability 

An attacker can bypass restrictions via Uncle/Cousin Tree of Drupal Subgroup, in order to escalate his privileges.
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This weakness impacts software or systems such as Drupal Modules ~ not comprehensive.

Our Vigil@nce team determined that the severity of this vulnerability announce is medium.

The trust level is of type confirmed by the editor, with an origin of user account.

An attacker with a expert ability can exploit this threat bulletin.

Solutions for this threat 

Drupal Subgroup: version 1.0.1.
The version 1.0.1 is fixed:
  https://www.drupal.org/project/subgroup/releases/1.0.1
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