The Group module enables you to hand out permissions on a smaller subset, section or community of your website.
With the 1.1 security release, new code was introduced to ensure proper access for all entity types, but a mistake introduced unexpected access to unpublished nodes.
Install the latest version:
- If you are using 8.x-1.0 or later, you should upgrade to 8.x-1.2.
- If you are using 8.x-1.0-rc5, that version is not affected by this issue. You can also consider upgrading to 8.x-1.2.