CVE-2025-64273 identifies a missing authorization vulnerability in the GetResponse Email marketing plugin for WordPress, specifically affecting versions up to and including 1.5.3. The vulnerability arises from improperly configured access control security levels, allowing attackers to bypass authorization checks. This means that unauthorized users can potentially access or manipulate sensitive email marketing functions or data that should be restricted. The plugin is widely used to manage email campaigns directly from WordPress sites, integrating marketing automation features. The lack of proper authorization checks can lead to unauthorized disclosure or modification of marketing lists, campaign settings, or subscriber data. Although no public exploits have been reported, the vulnerability’s nature makes it a significant risk, especially for organizations relying heavily on this plugin for customer engagement. The vulnerability does not require user interaction, and exploitation can be performed remotely if the attacker can reach the vulnerable endpoints. No CVSS score has been assigned yet, but the issue is recognized and published by Patchstack. The absence of patches at the time of reporting necessitates immediate attention to access controls and monitoring.

For European organizations, this vulnerability could lead to unauthorized access to sensitive marketing data, including subscriber lists and campaign configurations, potentially resulting in data breaches or manipulation of marketing communications. This could damage brand reputation, violate data protection regulations such as GDPR, and lead to financial losses due to compromised marketing operations. Attackers might use the vulnerability to inject malicious content into email campaigns or disrupt marketing workflows, impacting business continuity. Organizations relying on the GetResponse plugin for customer engagement and lead generation are particularly at risk. The impact extends to confidentiality, integrity, and availability of marketing data and services. Given the widespread use of WordPress and the popularity of GetResponse in Europe, the threat could affect a broad range of sectors including retail, finance, and media.

Until an official patch is released, organizations should implement strict network-level access controls to restrict access to the WordPress admin area and plugin endpoints, using IP whitelisting or VPNs where feasible. Review and harden WordPress user roles and permissions to minimize exposure. Enable detailed logging and monitoring of plugin-related activities to detect unauthorized access attempts promptly. Consider temporarily disabling the GetResponse plugin if it is not critical or replacing it with alternative solutions with verified security. Keep WordPress core and all plugins updated to the latest versions to reduce the attack surface. Once patches become available from GetResponse, prioritize their deployment. Conduct regular security audits and penetration tests focusing on plugin vulnerabilities. Educate administrators about the risks of unauthorized access and ensure strong authentication mechanisms are in place.