trainingbusinesspros Groundhogg Plugin up to 4.5.2 on WordPress Permission Callback /wp-json/gh/v4/contacts read_single ID resource injection

Summaryinfo

A vulnerability was found in trainingbusinesspros Groundhogg Plugin up to 4.5.2. It has been declared as problematic. The affected element is the function read_single of the file /wp-json/gh/v4/contacts of the component Permission Callback. Such manipulation of the argument ID leads to resource injection. This vulnerability is traded as CVE-2026-11454. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in trainingbusinesspros Groundhogg Plugin up to 4.5.2. Affected by this issue is the function read_single of the file /wp-json/gh/v4/contacts of the component Permission Callback. The manipulation of the argument id with an unknown input leads to a resource injection vulnerability. Using CWE to declare the problem leads to CWE-99. The product receives input from an upstream component, but it does not restrict or incorrectly restricts the input before it is used as an identifier for a resource that may be outside the intended sphere of control. Impacted is confidentiality. CVE summarizes:

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 4.5.2 via the GET /wp-json/gh/v4/contacts/<id> REST endpoint. The endpoint's permission callback checks only the role-level view_contacts capability and read_single() returns the full contact record by sequential integer ID without the object-level view_contact ownership check applied elsewhere in the codebase. This makes it possible for authenticated attackers holding view_contacts but not view_others_contacts — notably Groundhogg's built-in Sales Rep role, designed to see only its own contacts — to read any contact record on the site, including PII, contact meta, owner IDs, the admin edit URL, and (for contacts linked to a WordPress user) that user's full capability set.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-11454 since 06/06/2026. The exploitation is known to be easy. The attack may be launched remotely. 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 08/05/2026).

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

• 4.5.0
• 4.5.1
• 4.5.2

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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