eaSYNC Booking – Hotels, Restaurants & Car Rentals Security & Risk Analysis

The easync-booking plugin exhibits a mixed security posture. On the positive side, it demonstrates a strong commitment to secure coding practices by utilizing prepared statements for nearly all SQL queries (99%) and properly escaping a high percentage of its output (93%). The presence of 52 nonce checks and 37 capability checks indicates an awareness of WordPress security mechanisms. However, a significant concern arises from the large attack surface exposed through unprotected AJAX handlers, with 80 out of 105 handlers lacking authentication checks. This presents a prime opportunity for attackers to trigger unauthorized actions.

The taint analysis reveals 11 flows with unsanitized paths, all marked as high severity. This is a critical finding, suggesting potential vulnerabilities where user input is not adequately validated before being used in sensitive operations, such as file path manipulation. While there are no currently unpatched CVEs, the plugin has a history of 5 known vulnerabilities, including high-severity issues like Authorization Bypass, Missing Authorization, and Cross-Site Scripting. The most recent vulnerability in May 2025 suggests ongoing security challenges.

In conclusion, while the plugin has commendable secure coding fundamentals, the unprotected AJAX endpoints and the high number of critical taint flows are significant weaknesses that demand immediate attention. The historical vulnerability data also points to a need for more robust security testing and development practices to prevent recurrence of these issues. Addressing the unprotected entry points and sanitizing the identified taint flows are crucial steps to improve the plugin's security.