MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc. Security & Risk Analysis

Mailoptin v1.2.76.0 presents a mixed security posture. While it demonstrates good practices like extensive use of prepared statements for SQL queries and a significant number of nonce checks, several areas raise concerns. The presence of one AJAX handler without authentication checks is a direct entry point that could be exploited if not properly secured by other means. Additionally, a notable 11 out of 40 analyzed taint flows have unsanitized paths, indicating a potential for vulnerabilities even though no critical or high severity issues were found in the taint analysis itself. This suggests that while the plugin is actively working on sanitization, there are still areas where input might not be handled robustly.

The vulnerability history, while showing no currently unpatched CVEs, reveals a pattern of past vulnerabilities including Cross-site Scripting and Missing Authorization. The most recent vulnerability was in late 2025, which is a concern for a plugin version that may not have received updates since then, potentially leaving it susceptible to older, disclosed issues. The presence of a high severity vulnerability in the past, even if patched, warrants caution. Overall, Mailoptin has strengths in its implementation of secure coding practices, but the uncovered unprotected entry point and the historical pattern of authorization and XSS vulnerabilities necessitate careful monitoring and prompt updates to address any newly discovered issues.