Groundhogg — CRM, Newsletters, and Marketing Automation <= 4.5.2 — Insecure Direct Object Reference

Am I affected?

• Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Groundhogg — CRM, Newsletters, and Marketing Automation.
• No admin access? Run a passive check of your site. It reads public files only.

What to do

1. Update to version 4.5.3, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch Groundhogg — CRM, Newsletters, and Marketing Automation to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Lucius-log.

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.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

• Advisorywordfence.com

Related CVEs

Timeline

1. Aug 4, 2026

   CVE published

   Severity medium, CVSS 6.5

2. Nov 13, 2026

   Record last updated