HTML Contact Form Security & Risk Analysis

The html-contact-form plugin version 1.1.3 exhibits a generally good security posture based on the provided static analysis. It demonstrates several positive security practices, including the absence of dangerous functions, the exclusive use of prepared statements for SQL queries, and the presence of nonce and capability checks for its single entry point (a shortcode). Furthermore, the plugin has no recorded historical vulnerabilities (CVEs), which suggests a history of secure development or infrequent exposure to security flaws. The absence of critical or high-severity taint flows is also a strong indicator of secure code handling.

However, a significant concern arises from the complete lack of output escaping. With 4 total outputs analyzed and 0% properly escaped, this creates a substantial risk of Cross-Site Scripting (XSS) vulnerabilities. If user-supplied data is displayed directly on the page without proper sanitization or encoding, an attacker could inject malicious scripts, leading to session hijacking, defacement, or other harmful actions. The absence of any unauthenticated AJAX handlers or REST API routes is a positive aspect, limiting the potential attack surface in those areas.

In conclusion, while the plugin is strong in areas like database interaction and authentication checks, the unescaped output is a critical weakness that severely undermines its overall security. The lack of past vulnerabilities is encouraging but does not negate the present risk posed by the output escaping deficiency. Addressing the unescaped output is paramount to improving the plugin's security.