GHSA-472v-j2g4-g9h2 Craft CMS has a Path Traversal Vulnerability in AssetsController

• Packagist craftcms/cms: >= 4.0.0-RC1, < 4.17.5 → fixed in 4.17.5 • Packagist craftcms/cms: >= 5.0.0-RC1, < 5.9.11 → fixed in 5.9.11

The `AssetsController->replaceFile()` method has a `targetFilename` body parameter that is used unsanitized in a `deleteFile()` call before `Assets::prepareAssetName()` is applied on save. This allows an authenticated user with `replaceFiles` permission to delete arbitrary files within the same filesystem root by injecting `../` path traversal sequences into the filename. This could allow an authenticated user with `replaceFiles` permission on one volume to delete files in other folders/volumes that share the same filesystem root. This only affects local filesystems. Users should update to Craft 4.17.5 or 5.9.11 to mitigate the issue.