---
id: CVE-2026-18548
title: >-
  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…
summary: >-
  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…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: trainingbusinesspros
product: 'Groundhogg — CRM, Newsletters, and Marketing Automation'
affected:
  - groundhogg_crm_newsletters_and_marketing_automation <= 4.5.14
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T06:17:03.043'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18548'
references:
  - url: 'https://github.com/groundhoggwp/groundhogg/commit/8a6fe60e751e'
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.5.15/assets/js/admin/contacts/contact-editor.js#L848
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/791ee926-edd9-4615-9a46-1d8836938fd9?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-15T05:52:45.968Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.