The Eventer - WordPress Event & Booking Manager Plugin, widely used for managing events and bookings on WordPress sites, contains a critical SQL Injection vulnerability identified as CVE-2025-0959. This vulnerability arises from improper handling of the reg_id parameter, which is not sufficiently escaped or prepared before being incorporated into SQL queries. As a result, authenticated attackers with as low as Subscriber-level permissions can append arbitrary SQL commands to existing queries. This flaw stems from CWE-564, which involves SQL Injection due to insufficient escaping and preparation of user-supplied input. The vulnerability allows attackers to extract sensitive information from the backend database, potentially including user data, credentials, or other confidential information. The CVSS 3.1 base score of 8.8 reflects the vulnerability's high impact on confidentiality, integrity, and availability, combined with its ease of exploitation over the network without user interaction. Although no patches or official fixes are currently linked, the vulnerability affects all versions up to and including 3.9.9.2, indicating a broad exposure for users of this plugin. The lack of known exploits in the wild suggests it is newly disclosed, but the risk remains significant due to the plugin's popularity and the low privilege required to exploit it.

This vulnerability can have severe consequences for organizations using the Eventer plugin. Attackers can leverage it to access sensitive database contents, including personal user information, event details, and potentially administrative credentials. This can lead to data breaches, loss of customer trust, and regulatory penalties, especially under data protection laws like GDPR. The integrity of the database can be compromised by unauthorized modifications, potentially disrupting event management operations and causing financial and reputational damage. Availability may also be impacted if attackers execute destructive SQL commands. Since the exploit requires only Subscriber-level access, attackers can gain initial footholds through compromised low-privilege accounts or social engineering. The vulnerability's network accessibility and lack of user interaction requirements increase the likelihood of automated exploitation attempts, making it a critical threat to WordPress sites globally that rely on this plugin.

Immediate mitigation steps include restricting Subscriber-level users' access to the reg_id parameter functionality if possible, and monitoring logs for suspicious SQL query patterns. Site administrators should upgrade the Eventer plugin to a patched version once available. In the absence of an official patch, applying Web Application Firewall (WAF) rules to detect and block SQL Injection attempts targeting the reg_id parameter can reduce risk. Employing principle of least privilege by limiting user roles and permissions reduces the attack surface. Regular database backups and integrity checks will help in recovery if exploitation occurs. Developers should review and refactor the plugin code to use parameterized queries or prepared statements to prevent SQL Injection. Additionally, security teams should conduct vulnerability scans and penetration tests focusing on this plugin to identify exploitation attempts. Finally, educating users about phishing and credential hygiene can prevent attackers from gaining initial access with Subscriber-level accounts.