CVE-2023-38491

Summary

CVE-2023-38491 is a vulnerability affecting versions of the Kirby content management system prior to 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6. This issue pertains to sites that allow authenticated Panel users or external file uploads to the content folder. An attacker could upload a file with a hidden `.xyz` extension containing malicious HTML code, which could be triggered by victims accessing the link in a browser while logged into Kirby. The vulnerability stems from the `Kirby\\Http\\Response::file()` method, which did not have an explicit fallback MIME type, leading browsers to assume `text/html` and run the embedded script. The issue has been patched in the mentioned Kirby releases, which now use a fallback MIME type of `text/plain` and the `X-Content-Type-Options: nosniff` header to prevent this behavior.

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