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**Name of the Vulnerable Software and Affected Versions** JAB Guest Book (affected versions not specified) **Description** A cross-site scripting (XSS) issue exists, allowing remote attackers to inject arbitrary web script or HTML via the `author` parameter in the pbguestbook.php file. **Recommendations** As a temporary workaround, consider restricting the use of the `author` parameter in the pbguestbook.php file until a patch is available.