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**Name of the Vulnerable Software and Affected Versions** Mybb Mybb Forums version 1.8.33 **Description** The issue allows a local attacker to execute arbitrary code via the `theme Name` parameter in the theme management component. This is a Cross Site Scripting issue. **Recommendations** For Mybb Mybb Forums version 1.8.33, consider restricting access to the theme management component to minimize the risk of exploitation. Avoid using the `theme Name` parameter in the theme management component until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.