CVE-2026-18387

The Groundhogg plugin for WordPress (versions up to and including 4.9.3) is vulnerable to arbitrary file deletion due to insufficient file path validation in the copy_file function. An authenticated attacker with Sales Representative-level access or above can delete arbitrary files on the server, which can easily lead to remote code execution.

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ref' parameter in all versions up to, and including, 4.5.14 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Groundhogg plugin for WordPress is vulnerable to Privilege Escalation in versions up to and including 4.8.3. The create_support_user() function identifies the support account solely by matching against publicly hardcoded constants, allowing an attacker with an account having login 'groundhogg' and matching email to be promoted to administrator, and to super admin on multisite.

The Groundhogg plugin for WordPress up to version 4.9 is vulnerable to privilege escalation. Missing ownership and capability checks in the 'process_edit()' function allow authenticated users with 'edit_contacts' capability (e.g., sales reps) to reassign a contact to any WordPress account, including an administrator, and then use the auto-login URL to authenticate as that administrator.

Groundhogg plugin in versions up to and including 4.8.3 contains a Sensitive Data Exposure vulnerability exploitable by an unauthenticated attacker.

The Groundhogg plugin for WordPress (versions up to 4.8.3) contains a Blind SQL Injection vulnerability due to improper neutralization of special elements in SQL commands.

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to privilege escalation via contact identity rebinding. The create_contact function in the v3 REST endpoint is gated only by the add_contacts capability and forwards the full payload, including user_id, to the upsert path, bypassing ownership guards. This allows attackers with Sales Representative-level access and above to rebind a contact to an Administrator's user ID and then use the v4 email-test endpoint to gain an admin session.

import_contacts Path Traversal in Groundhogg <= 4.7.1 versions.

The Groundhogg — CRM, Newsletters, and Marketing Automation WordPress plugin before version 4.7.2 does not restrict the redirect target of its email preference confirmation flow to the site's own host, allowing unauthenticated attackers to redirect visitors to an arbitrary external URL by way of a crafted link.

The Groundhogg — CRM, Newsletters, and Marketing Automation WordPress plugin before 4.5.13 does not validate or escape values submitted to some optional web form fields before storing and outputting them in an administrative area, allowing unauthenticated users to perform Stored Cross-Site Scripting attacks against high privilege users.