Versions of browserify-hmr prior to 0.4.0 are missing origin validation on the websocket server.

This vulnerability allows a remote attacker to steal a developer's source code because the origin of requests to the websocket server that is used for Hot Module Replacement (HMR) are not validated.

Recommendation

Upgrade to version 0.4.0 or later.

References

• Macil/browserify-hmr#41
• https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20Messages)
• https://www.npmjs.com/advisories/726
• https://nvd.nist.gov/vuln/detail/CVE-2018-14730
• https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20Messages