Simple Mortgage Calculator Security & Risk Analysis

The "ct-mortgage-calculator" plugin version 1.4.0 presents a mixed security posture. On the positive side, it demonstrates good practices by using prepared statements for all SQL queries and has no recorded vulnerability history (CVEs), suggesting a relatively stable and well-maintained codebase in the past. The attack surface is small, with only one shortcode and no unprotected AJAX handlers or REST API routes.

However, significant concerns arise from the static analysis. The presence of the `unserialize` function is a critical risk, as it can lead to Remote Code Execution (RCE) if improperly handled with untrusted input. Furthermore, a very low percentage (12%) of output escaping is a serious weakness, opening the door to Cross-Site Scripting (XSS) vulnerabilities. The absence of nonce checks and capability checks on potential entry points (even though the total number is low) also weakens its defenses against various attack vectors.

In conclusion, while the plugin avoids common pitfalls like unpatched CVEs and raw SQL queries, the identified risks related to `unserialize` and insufficient output escaping are substantial. These weaknesses, if exploited, could lead to severe security breaches. The lack of explicit authorization checks on certain functions further compounds these concerns.