CVE-2025-48327 is a Missing Authorization vulnerability (CWE-862) identified in the WordPress plugin WP Mailgun SMTP developed by inkthemes. This vulnerability affects versions up to 1.0.7 of the plugin. The core issue arises because certain functionality within the plugin is accessible without proper Access Control List (ACL) enforcement, allowing unauthenticated attackers to invoke functions that should be restricted. According to the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N), the vulnerability can be exploited remotely over the network without any privileges or user interaction, resulting in limited confidentiality impact but no impact on integrity or availability. The vulnerability does not require authentication or user interaction, making it easier to exploit. However, the impact is limited to information disclosure or unauthorized access to some data or functionality that should be protected. There are no known exploits in the wild at the time of publication, and no patches have been linked yet. The vulnerability was reserved in May 2025 and published in August 2025. The plugin WP Mailgun SMTP is used to configure WordPress sites to send emails via the Mailgun service, which is often critical for transactional and notification emails. Missing authorization in this context could allow attackers to access or manipulate email sending functionality or related configuration data that should be restricted, potentially leading to information leakage or abuse of email sending capabilities.

For European organizations using WordPress sites with the WP Mailgun SMTP plugin, this vulnerability poses a moderate risk. Unauthorized access to email sending functionality could allow attackers to send phishing or spam emails appearing to originate from legitimate domains, undermining trust and potentially leading to further social engineering attacks. Confidentiality impact, while limited, could expose sensitive configuration details or email content if the plugin exposes such data through the unauthorized functions. This could be particularly damaging for organizations handling personal data under GDPR, as unauthorized data exposure can lead to regulatory penalties. The lack of impact on integrity and availability reduces the risk of site defacement or denial of service, but the ability to misuse email functionality can still disrupt business communications and damage reputation. Since WordPress is widely used across Europe for websites of all sizes, and Mailgun is a popular email delivery service, many organizations could be affected if they have not updated or mitigated this vulnerability. The medium CVSS score reflects this moderate but non-trivial risk.

Organizations should immediately audit their WordPress installations to identify if the WP Mailgun SMTP plugin is installed and determine the version in use. If the affected version (up to 1.0.7) is present, they should monitor for official patches or updates from inkthemes and apply them as soon as they become available. In the absence of an official patch, organizations can mitigate risk by restricting access to the WordPress admin area and plugin endpoints via web application firewalls (WAFs) or IP whitelisting to reduce exposure to unauthenticated requests. Additionally, reviewing and hardening WordPress user roles and permissions can limit the potential damage from exploitation. Monitoring outgoing email logs for unusual activity can help detect abuse attempts. Organizations should also consider disabling the plugin temporarily if email functionality can be handled by alternative secure methods until a patch is released. Finally, implementing network-level protections and intrusion detection systems to identify anomalous access patterns targeting the plugin endpoints can provide early warning of exploitation attempts.