CVE-2018-14731

An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1 connection (with a random TCP port number) from any origin. The random port number can be found by connecting to http://127.0.0.1 and reading the "new WebSocket" line in the source code.

• CWE-200

• https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20MessagesExploit, Third Party Advisory
• https://github.com/parcel-bundler/parcel/issues/1783Vendor Advisory
• https://github.com/parcel-bundler/parcel/pull/1794Exploit, Patch, Vendor Advisory
• https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20MessagesExploit, Third Party Advisory
• https://github.com/parcel-bundler/parcel/issues/1783Vendor Advisory
• https://github.com/parcel-bundler/parcel/pull/1794Exploit, Patch, Vendor Advisory

Published

Sep 21, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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