Plain Event Calendar Security & Risk Analysis

The plain-event-calendar plugin version 2.1.0 exhibits a generally strong security posture based on the provided static analysis. The plugin demonstrates good practices by using prepared statements for all SQL queries, indicating a low risk of SQL injection vulnerabilities. Furthermore, the absence of known CVEs and historical vulnerabilities suggests a commitment to security or a lack of widespread exploitation. The code signals also reveal a relatively small attack surface, with no unprotected AJAX handlers or REST API routes, and a single shortcode which is likely controlled. However, there are a few areas that could be improved. The plugin has a notable percentage of output that is not properly escaped, which could lead to cross-site scripting (XSS) vulnerabilities if user-supplied data is directly outputted without sanitization. Additionally, the complete lack of nonce checks across its entry points is a significant concern, as it leaves the plugin susceptible to Cross-Site Request Forgery (CSRF) attacks. While the capability check is present, the absence of nonces is a critical oversight for user-facing actions.