CVE-2023-6551

Summary

CVE-2023-6551 is a stored XSS vulnerability affecting the class.upload.php library. This library, due to its simplicity, fails to conduct a thorough check on uploaded files, making it susceptible to XSS attacks when the default configuration is used. To mitigate this risk, developers must implement extension whitelisting in conjunction with forcing the server to provide content-types based on file extensions. The library's README has been updated to include these essential security measures.

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