PlugStudio Installment Calculator for WooCommerce Security & Risk Analysis

The "mz-calculate-fees" plugin v1.0.3 exhibits a generally strong security posture based on the provided static analysis. The plugin has a small attack surface with only two AJAX handlers, and importantly, none of these appear to be unprotected by authentication checks. The code also demonstrates good practices regarding output escaping, with a high percentage of outputs properly escaped. Furthermore, the absence of any file operations or external HTTP requests reduces potential attack vectors.

However, there are a few areas that warrant attention. While the majority of SQL queries utilize prepared statements, a significant portion (40%) does not. This could represent a potential risk for SQL injection vulnerabilities if the unsanitized inputs are ever used in these queries. The plugin also includes three nonce checks, but only one capability check, suggesting that not all entry points might be adequately authorized for all users. The lack of any recorded vulnerabilities in its history is a positive indicator, suggesting the developers are either diligent or the plugin has not been a significant target.

In conclusion, the plugin is well-designed with good basic security hygiene. The primary concern lies in the non-prepared SQL queries, which should be addressed to eliminate potential injection risks. The limited number of capability checks also suggests a potential for privilege escalation if not carefully managed. Despite these minor concerns, the overall security is robust, especially given the absence of known vulnerabilities.