WebSocket RCE Vulnerability Patched in CurseForge Launcher

A recently disclosed and now-patched Remote Code Execution (RCE) vulnerability in the CurseForge Launcher exploited an unauthenticated local WebSocket API. According to the disclosure, this flaw allowed arbitrary code execution through WebSocket connections accessible from the browser. WebSocket-based RCE vulnerabilities typically emerge when applications expose WebSocket endpoints without proper authentication or input validation. In this case, the local API's accessibility from the browser created an attack vector for code execution. The impact of such vulnerabilities is severe, as successful exploitation could lead to full system compromise. Given CurseForge's widespread use among gamers, this flaw had potential for significant impact prior to patching. From a defensive perspective, this incident underscores the necessity of securing all network interfaces, including local APIs. Developers should enforce authentication and validate all inputs for WebSocket endpoints, even those intended for local use only. However, without access to the full technical disclosure from the original source, this analysis is based solely on the information provided in the initial message. For complete technical details and mitigation guidance, refer to the official advisory.