CVE-2026-11454
Received Received - Intake

Insecure Direct Object Reference in Groundhogg WordPress Plugin

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Wordfence

Description
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.

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-11454
EUVD
EUVD-2026-53177

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
groundhogg groundhogg to 4.5.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

This vulnerability is an Insecure Direct Object Reference (IDOR) in the Groundhogg WordPress plugin. It allows authenticated users with the view_contacts capability but not view_others_contacts to read any contact record via a REST endpoint. The endpoint exposes sensitive data like PII, contact meta, and user capabilities without proper ownership checks.

Detection Guidance

Check WordPress sites running Groundhogg plugin versions up to 4.5.2 for unauthorized access to /wp-json/gh/v4/contacts/<id> endpoints. Monitor logs for repeated GET requests to this REST API path with sequential IDs.

Impact Analysis

An attacker with the Sales Rep role or similar access could exploit this to view all contact records on the site, including personally identifiable information (PII), contact details, and linked WordPress user capabilities. This could lead to data breaches or unauthorized access to sensitive information.

Compliance Impact

This vulnerability could violate GDPR by exposing PII without proper access controls. For HIPAA, it may compromise protected health information if contact records include such data. Non-compliance risks fines and legal penalties under these regulations.

Mitigation Strategies

Update the Groundhogg plugin to the latest version beyond 4.5.2. Temporarily restrict access to the /wp-json/gh/v4/contacts/ endpoint via web server rules or firewall. Review user roles with view_contacts capability to ensure least privilege.

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