CVE-2025-3107 is a medium-severity SQL Injection vulnerability affecting the Newsletters plugin for WordPress, developed by contrid. This vulnerability exists in all versions up to and including 4.9.9.8. The root cause is improper neutralization of special elements in the 'orderby' parameter, which is used in SQL queries without sufficient escaping or parameterization. Specifically, authenticated users with Contributor-level access or higher can exploit this flaw by injecting malicious SQL code into the 'orderby' parameter. This injection is time-based, allowing attackers to infer data by measuring response delays. The vulnerability enables attackers to append additional SQL queries to existing ones, potentially extracting sensitive information from the backend database. Notably, this attack does not require user interaction beyond authentication, and the vulnerability affects the confidentiality of data but does not impact integrity or availability. The CVSS 3.1 base score is 6.5, reflecting a network attack vector with low attack complexity, requiring privileges but no user interaction, and resulting in high confidentiality impact without affecting integrity or availability. No known exploits are currently reported in the wild, and no patches have been published at the time of disclosure.

For European organizations using WordPress with the contrid Newsletters plugin, this vulnerability poses a significant risk to the confidentiality of sensitive data stored in their databases, including subscriber information, email content, and potentially other linked data. Since the attack requires only Contributor-level access, which is a relatively low privilege level often granted to content creators or marketers, the attack surface is broader than vulnerabilities requiring administrative access. Exploitation could lead to unauthorized data disclosure, violating GDPR and other data protection regulations, resulting in legal and reputational consequences. The lack of impact on integrity and availability reduces the risk of service disruption but does not diminish the severity of data leakage. Organizations relying on this plugin for newsletter management, especially those handling personal data of EU citizens, must consider this vulnerability critical to their data protection posture.

Immediate mitigation steps include restricting Contributor-level access strictly to trusted users and auditing existing user roles to minimize unnecessary privileges. Organizations should implement Web Application Firewalls (WAFs) with custom rules to detect and block suspicious SQL injection patterns targeting the 'orderby' parameter. Monitoring database query logs for unusual or time-delayed queries can help identify exploitation attempts. Since no official patch is available yet, consider temporarily disabling or replacing the Newsletters plugin with alternative solutions that do not exhibit this vulnerability. Additionally, applying the principle of least privilege to database accounts used by WordPress can limit data exposure if exploitation occurs. Regular backups and incident response plans should be updated to address potential data breaches stemming from this vulnerability.