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The Groups plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.7.0 via the 'group_id' parameter of the group_join function due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, to register for groups other than ones set in the shortcode.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Groups Plugin | — | Update groups plugin to version 3.8.0, or a newer patched version | Nov 10, 2025 | Nov 7, 2025 |
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