trainingbusinesspros Groundhogg Plugin up to 4.9 on WordPress Contact Identity Rebinding /gh/v3/contacts create_contact user_id privileges management

Summaryinfo

A vulnerability, which was classified as critical, was found in trainingbusinesspros Groundhogg Plugin up to 4.9. This impacts the function create_contact of the file /gh/v3/contacts of the component Contact Identity Rebinding. The manipulation of the argument user_id results in privileges management. This vulnerability was named CVE-2026-97644. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in trainingbusinesspros Groundhogg Plugin up to 4.9. It has been classified as critical. Affected is the function create_contact of the file /gh/v3/contacts of the component Contact Identity Rebinding. The manipulation of the argument user_id with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to Privilege Escalation via Contact Identity Rebinding in all versions up to, and including, 4.9 The vulnerability exists because the `create_contact` function in the v3 REST endpoint (`POST /gh/v3/contacts`) is gated solely by the `add_contacts` capability and forwards the full request payload — including the security-bearing `user_id` column — into the upsert path of `Contacts_DB::add()`, which bypasses the ownership guard that `Contacts_DB::update()` enforces, allowing an attacker to rebind any existing contact record to an arbitrary WordPress user ID. This makes it possible for authenticated attackers with Sales Representative-level access and above to upsert their own contact row to point to an Administrator's user ID, then invoke the v4 email-test endpoint (`POST /gh/v4/emails/test`) — also accessible to the Sales Representative role via the `send_emails` capability — to generate an `{auto_login_url}` one-time permissions key bound to the rebound contact, and consume that link to call `wp_set_auth_cookie()` and gain a fully authenticated session as the WordPress Administrator.

The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-97644 since 09/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/03/2026). The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• trainingbusinesspros

Name

• Groundhogg Plugin

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9

CPE 2.3info

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CPE 2.2info

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