CVE-2025-64367 identifies a stored Cross-site Scripting (XSS) vulnerability in the Groundhogg plugin, a marketing automation and CRM tool for WordPress developed by Adrian Tobey. The vulnerability is caused by improper neutralization of input during web page generation, which allows malicious actors to inject and store arbitrary JavaScript code within the application. When a victim user accesses the affected page, the malicious script executes in their browser context, potentially leading to session hijacking, unauthorized actions, or data theft. The vulnerability affects all Groundhogg versions up to and including 4.2.6. Exploitation requires the attacker to have low privileges (PR:L) and user interaction (UI:R), such as tricking a user into visiting a crafted URL or page. The CVSS vector indicates network attack vector (AV:N), low attack complexity (AC:L), and a scope change (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact includes partial confidentiality, integrity, and availability loss. No public exploits are known yet, but the vulnerability is published and should be addressed promptly. Groundhogg is widely used in WordPress environments for customer engagement, making this vulnerability relevant for organizations relying on this plugin for marketing and customer relationship management.

For European organizations, the impact of this vulnerability can be significant, especially for those using Groundhogg in their WordPress environments to manage customer data and marketing workflows. Exploitation could lead to unauthorized access to sensitive customer information, session hijacking of administrative users, and manipulation of marketing data. This can result in reputational damage, regulatory non-compliance (e.g., GDPR violations due to data leakage), and operational disruption. Since the vulnerability allows scope change, attackers might leverage it to compromise other parts of the network or escalate privileges. Organizations with public-facing WordPress sites using Groundhogg are particularly at risk. The medium severity rating reflects the balance between the ease of exploitation and the potential damage, but the actual impact depends on the deployment context and user privileges.

1. Immediately review and apply any available patches or updates from the Groundhogg vendor once released. 2. Implement strict input validation and output encoding on all user-supplied data within the Groundhogg plugin to prevent script injection. 3. Restrict user privileges to the minimum necessary, especially limiting who can submit or edit content that is rendered on web pages. 4. Employ Web Application Firewalls (WAFs) with rules to detect and block common XSS payloads targeting Groundhogg endpoints. 5. Conduct regular security audits and penetration testing focusing on WordPress plugins, including Groundhogg. 6. Educate users and administrators about the risks of clicking on suspicious links or interacting with untrusted content. 7. Monitor logs for unusual activity that could indicate exploitation attempts. 8. Consider isolating or sandboxing the Groundhogg plugin environment to limit the scope of potential compromise.