CVE-2025-47466 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the Rustaurius Ultimate WP Mail plugin for WordPress, affecting versions up to and including 1.3.4. CSRF vulnerabilities occur when an attacker tricks an authenticated user into submitting a forged request to a web application, thereby performing unwanted actions on behalf of the user without their consent. In this case, the vulnerability allows an attacker to exploit the Ultimate WP Mail plugin by crafting malicious requests that, when executed by an authenticated WordPress user, could alter plugin settings or trigger actions unintended by the user. The CVSS v3.1 base score is 5.4 (medium severity), with the vector indicating that the attack can be performed remotely over the network (AV:N), requires low attack complexity (AC:L), does not require privileges (PR:N), but does require user interaction (UI:R). The impact affects integrity and availability, with no confidentiality impact. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability is classified under CWE-352, which specifically relates to CSRF attacks. Since the plugin integrates with WordPress, a widely used content management system, the attack surface is significant, especially for websites relying on Ultimate WP Mail for email functionalities. The lack of authentication requirements for the attacker and the low complexity of the attack make this a notable risk, although the need for user interaction somewhat limits the attack vectors to scenarios where users can be socially engineered or tricked into clicking malicious links or visiting crafted web pages.

For European organizations, the impact of this CSRF vulnerability can be significant, particularly for those relying on the Ultimate WP Mail plugin for critical email communications within their WordPress sites. Successful exploitation could lead to unauthorized changes in mail configurations, potentially disrupting email delivery, causing denial of service in communication channels, or enabling further attacks such as phishing or spam campaigns originating from compromised sites. This could affect the integrity and availability of email services, impacting business operations, customer communications, and internal workflows. Moreover, organizations subject to strict data protection regulations like GDPR may face compliance risks if the vulnerability leads to unauthorized data manipulation or service disruptions. The medium severity rating suggests that while the vulnerability is not critical, it still poses a tangible threat that could be leveraged as part of a broader attack chain, especially in environments where users have elevated privileges or where social engineering is feasible. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the potential for future exploitation.

To mitigate this vulnerability, European organizations should take the following specific actions: 1) Immediately review and update the Ultimate WP Mail plugin to the latest version once a patch is released by Rustaurius. In the absence of an official patch, consider temporarily disabling the plugin or restricting its usage to trusted administrators only. 2) Implement and enforce strict Content Security Policies (CSP) and SameSite cookie attributes to reduce the risk of CSRF attacks by limiting cross-origin requests and cookie transmission. 3) Educate users, especially administrators, about the risks of social engineering and phishing attacks that could trigger CSRF exploits, emphasizing cautious behavior when clicking links or visiting unknown websites. 4) Employ Web Application Firewalls (WAFs) with rules designed to detect and block CSRF attack patterns targeting WordPress plugins. 5) Regularly audit and monitor logs for unusual configuration changes or email behavior that could indicate exploitation attempts. 6) Consider deploying additional CSRF tokens or nonce verification mechanisms at the application level if custom development is feasible, to strengthen defenses beyond the plugin’s default protections.