Custom SMTP: Email Deliverability – FREE & Easy-to-use Security & Risk Analysis

The 'custom-smtp' plugin v2.1.0 exhibits a generally good security posture, with no known past vulnerabilities and a strong emphasis on protective measures in its code. The plugin implements nonce checks and capability checks on all its identified entry points, including AJAX handlers. The SQL query usage is also promising, with a high percentage utilizing prepared statements, mitigating risks of SQL injection. File operations are present but limited to one instance, and external HTTP requests are absent, further reducing the attack surface. However, the taint analysis reveals two flows with unsanitized paths, both flagged with high severity. While these might not have led to critical vulnerabilities, they represent a significant concern as they indicate potential for data manipulation or unintended execution if exploited. The lack of past CVEs is a positive indicator of mature development, but the presence of high-severity taint flows in the current analysis suggests that the plugin is not entirely risk-free and requires careful scrutiny of these specific code paths.