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**Name of the Vulnerable Software and Affected Versions** kkFileView version 4.0.0 **Description** The issue is related to a cross-site scripting (XSS) vulnerability. This vulnerability can be exploited via the `url` parameter at the "/controller/OnlinePreviewController.java" endpoint. **Recommendations** For kkFileView version 4.0.0, as a temporary workaround, consider restricting access to the "/controller/OnlinePreviewController.java" endpoint to minimize the risk of exploitation. Avoid using the `url` parameter in this endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.