Today’s browsers are almost operating systems unto themselves. They can run software programs and encrypt files. These capabilities, combined with the browser’s access to the host computer’s files – including ones in the cloud, shared folders and external drives – via the File System Access API creates a new opportunity for ransomware.
Imagine you want to edit photos on a benign-looking free online photo editing tool. When you upload the photos for editing, any hackers who control the malicious editing tool can access the files on your computer via your browser. The hackers would gain access to the folder you are uploading from and all subfolders.
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Source: MSN News
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