Nextend · Nextend Facebook Connect · CVE-2015-4413
**Name of the Vulnerable Software and Affected Versions**
Nextend Facebook Connect plugin versions prior to 1.5.6
**Description**
The issue is related to a cross-site scripting (XSS) vulnerability. It allows remote attackers to inject arbitrary web script or HTML via the `redirect to` parameter in the `new fb sign button` function.
**Recommendations**
For versions prior to 1.5.6, update to version 1.5.6 or later to resolve the issue. As a temporary workaround, consider restricting access to the `new fb sign button` function in the nextend-facebook-connect.php file until the update is applied. Avoid using the `redirect to` parameter in the affected function until the issue is resolved.