Attackers could start abusing GitHub Codespaces, a new service that allows developers to create and test applications inside development containers running on GitHub’s servers. Developers can make their applications accessible via public GitHub URLs for preview by others, a functionality that can be abused to distribute malware payloads in a stealthy way.

“If the application port is shared privately, browser cookies are used and required for authentication,” researchers from security firm Trend Micro said in a new report. “However, if ports are shared with the public (that is, without authentication or authentication context), attackers can abuse this feature to host malicious content such as scripts and malware samples.”