CVE-2026-4809: Laravel Mediable Prefer Client Mime Type
laravel-mediable's MediaUploader is configured to prefer the client-supplied MIME type (preferClientMimeType() / 'prefer_client_mime_type' => true / legacy 'mime_type_source' => 'client'). selectMimeType() will then return the value of the attacker-controlled HTTP Content-Type header (Symfony UploadedFile::getClientMimeType()) for MIME and aggregate-type val
PHPgreprules fetch cve-2026-4809-laravel-mediable-prefer-client-mime-type --engine opengrepDescription
laravel-mediable's MediaUploader is configured to prefer the client-supplied MIME type (preferClientMimeType() / 'prefer_client_mime_type' => true / legacy 'mime_type_source' => 'client'). selectMimeType() will then return the value of the attacker-controlled HTTP Content-Type header (Symfony UploadedFile::getClientMimeType()) for MIME and aggregate-type val
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