CVE-2026-1258 is a blind SQL Injection vulnerability identified in the Mail Mint plugin for WordPress, which is widely used for newsletters, email marketing, automation, WooCommerce emails, and post notifications. The vulnerability affects all versions up to and including 1.19.2. It stems from insufficient escaping and lack of prepared statements in SQL queries that handle user-supplied parameters such as 'order-by', 'order-type', and 'selectedCourses' across multiple API endpoints ('forms', 'automation', 'email/templates', and 'contacts/import/tutorlms/map'). An attacker with administrator-level privileges can exploit this flaw by injecting additional SQL commands into existing queries, potentially extracting sensitive information from the backend database without triggering error messages (blind SQLi). The vulnerability does not require user interaction but does require high-level privileges, limiting exploitation to insiders or compromised admin accounts. The CVSS score is 4.9 (medium), reflecting the moderate risk due to the privilege requirement and the impact limited to confidentiality. No patches or known exploits have been reported yet, but the vulnerability poses a significant risk to data confidentiality in affected environments. The plugin’s integration with WooCommerce and email marketing functions makes it a valuable target for attackers seeking customer or transactional data.

For European organizations, this vulnerability can lead to unauthorized disclosure of sensitive customer and transactional data stored in WordPress databases, including personal information managed through WooCommerce and email marketing campaigns. This could result in data breaches violating GDPR requirements, leading to legal penalties and reputational damage. Since exploitation requires administrator privileges, the threat is heightened if internal accounts are compromised or if malicious insiders exist. The blind nature of the SQL Injection means attackers can stealthily extract data over time, complicating detection. Organizations relying heavily on WordPress for e-commerce and marketing automation are particularly vulnerable, potentially affecting customer trust and business continuity. Although availability and integrity are not directly impacted, the confidentiality breach alone is significant under European data protection regulations.

1. Immediately restrict administrator-level access to trusted personnel and enforce strong authentication mechanisms such as multi-factor authentication (MFA). 2. Implement strict input validation and sanitization on all user-supplied parameters, especially 'order-by', 'order-type', and 'selectedCourses', using whitelisting approaches. 3. Employ prepared statements with parameterized queries in the plugin’s code to prevent SQL Injection. 4. Monitor database query logs for unusual or repeated patterns indicative of blind SQL Injection attempts. 5. Regularly audit and update WordPress plugins and core software to the latest versions once patches become available. 6. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block SQL Injection payloads targeting the vulnerable endpoints. 7. Educate administrators on the risks of privilege misuse and the importance of secure credential management. 8. If patching is not immediately possible, temporarily disable or restrict access to the vulnerable API endpoints to reduce attack surface.