CVE-2025-9807 is a high-severity SQL Injection vulnerability affecting The Events Calendar plugin for WordPress, versions up to and including 6.15.1. The vulnerability arises from improper neutralization of special elements used in SQL commands (CWE-89), specifically due to insufficient escaping of the user-supplied 's' parameter. This parameter is incorporated into SQL queries without adequate preparation or parameterization, allowing unauthenticated attackers to inject malicious SQL code. The injection is time-based, enabling attackers to infer database information by measuring response delays. Exploitation does not require authentication or user interaction, and the attack vector is remote network access. Successful exploitation can lead to unauthorized extraction of sensitive data from the backend database, compromising confidentiality. The vulnerability does not impact data integrity or availability directly but poses a significant risk of data leakage. No known exploits are reported in the wild as of the publication date (September 12, 2025). The CVSS v3.1 score is 7.5 (high), reflecting the ease of exploitation and the high impact on confidentiality. The plugin is widely used in WordPress environments for event management, making this vulnerability relevant to many websites globally. The lack of available patches at the time of disclosure increases the urgency for mitigation measures.

For European organizations, this vulnerability poses a substantial risk, especially for those relying on WordPress sites with The Events Calendar plugin for event management and public engagement. Exploitation could lead to unauthorized disclosure of sensitive customer data, internal event details, or other confidential information stored in the database. This could result in reputational damage, regulatory penalties under GDPR due to data breaches, and potential financial losses. Public sector entities, educational institutions, and private enterprises using this plugin are at risk. The vulnerability's unauthenticated nature means attackers can exploit it without credentials, increasing exposure. Additionally, the widespread use of WordPress in Europe amplifies the potential attack surface. Organizations hosting event-related data that is critical or sensitive are particularly vulnerable. The absence of known exploits currently provides a window for proactive defense, but the situation could evolve rapidly once exploit code becomes available.

1. Immediate mitigation involves disabling or removing The Events Calendar plugin until a security patch is released. 2. Monitor official vendor channels and security advisories for patches or updates addressing CVE-2025-9807 and apply them promptly. 3. Implement Web Application Firewalls (WAFs) with custom rules to detect and block suspicious SQL injection patterns targeting the 's' parameter. 4. Employ input validation and sanitization at the application level where possible, restricting or filtering input to the vulnerable parameter. 5. Conduct thorough security audits of WordPress installations to identify and isolate vulnerable plugin versions. 6. Restrict database user privileges associated with the WordPress application to the minimum necessary to limit potential data exposure. 7. Enable detailed logging and monitoring to detect anomalous query patterns or unusual access attempts. 8. Educate site administrators on the risks of using outdated plugins and the importance of timely updates. These steps go beyond generic advice by focusing on immediate plugin management, proactive monitoring, and layered defenses tailored to this specific vulnerability.