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**Name of the Vulnerable Software and Affected Versions** OPNsense versions prior to 23.7.5 **Description** The issue is related to the lack of protection of the web page structure in the OPNsense operating system. This can be exploited by a remote attacker to conduct cross-site scripting attacks using the `sequence` parameter in the `index.php` endpoint. **Recommendations** For versions prior to 23.7.5, update to version 23.7.5 or later to resolve the issue. As a temporary workaround, consider restricting access to the `index.php` endpoint in the Lobby Dashboard to minimize the risk of exploitation. Avoid using the `sequence` parameter in the affected endpoint until the issue is resolved.