CVE-2025-9807 in Events Calendar Plugin
Summary
by MITRE • 09/12/2025
The The Events Calendar plugin for WordPress is vulnerable to time-based SQL Injection via the ‘s’ parameter in all versions up to, and including, 6.15.1 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.
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Analysis
by VulDB Data Team • 09/12/2025
The CVE-2025-9807 vulnerability affects the Events Calendar plugin for WordPress, a widely used calendar management solution that has been integrated into numerous websites across the internet. This particular flaw represents a critical security weakness that has existed in versions up to and including 6.15.1, making it a significant concern for WordPress administrators and security professionals who maintain sites using this plugin. The vulnerability stems from improper input validation and sanitization mechanisms within the plugin's codebase, specifically in how it handles user-supplied data through the 's' parameter.
The technical exploitation of this vulnerability occurs through a time-based SQL injection attack vector that leverages insufficient escaping of the 's' parameter in the plugin's SQL queries. When an attacker submits malicious input through this parameter, the plugin fails to properly sanitize or prepare the data before incorporating it into existing database queries. This lack of proper input validation creates an opening where attackers can manipulate the SQL execution flow by appending additional SQL commands to the existing queries. The vulnerability is particularly dangerous because it operates through time-based techniques that allow attackers to infer information from the database without direct output mechanisms, making detection more challenging.
The operational impact of this vulnerability extends beyond simple data theft, as it provides attackers with the capability to extract sensitive information from the WordPress database through carefully crafted SQL injection payloads. Unauthenticated attackers can exploit this weakness to access user credentials, personal information, plugin configurations, and potentially gain deeper system access. The time-based nature of the attack means that even if the database does not return direct output, attackers can still extract data through timing variations in database responses. This vulnerability represents a significant threat to WordPress sites using the Events Calendar plugin, particularly those that handle sensitive data or have large user bases where the stolen information could be monetized or used for further attacks.
Mitigation strategies for CVE-2025-9807 should prioritize immediate plugin updates to versions that address the SQL injection vulnerability, as this represents the most effective defense mechanism. Organizations should implement comprehensive input validation and parameterized queries to prevent similar issues in their applications, following established security practices such as those outlined in the OWASP Top Ten and CWE-89. Additionally, network-level protections including web application firewalls and intrusion detection systems should be configured to monitor for suspicious SQL injection patterns. Security professionals should also conduct thorough vulnerability assessments of their WordPress installations to identify other potential SQL injection vulnerabilities and ensure that all plugins and themes are regularly updated. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, highlighting the importance of proper input sanitization and the need for continuous security monitoring of web applications.