CVE-2018-14731: Information Exposure

September 21, 2018 (updated November 27, 2018)

An issue was discovered in HMRServer.js in Parcel. 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:// connection (with a random TCP port number) from any origin.

References

github.com/parcel-bundler/parcel/issues/1783
github.com/parcel-bundler/parcel/pull/1794
nvd.nist.gov/vuln/detail/CVE-2018-14731

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