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**Name of the Vulnerable Software and Affected Versions** s2Member Pro plugin versions prior to 111220 **Description** A cross-site scripting (XSS) issue exists, allowing remote attackers to inject arbitrary web script or HTML via the `s2member pro authnet checkout[coupon]` parameter, also known as the Coupon Code field. **Recommendations** For versions prior to 111220, update to version 111220 or later to resolve the issue. As a temporary workaround, consider restricting access to the `s2member pro authnet checkout[coupon]` parameter to minimize the risk of exploitation.