What’s Vulnerable › Vulnerabilities

CVE-2018-14732

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-09-21 · updated 2026-06-17
• Weakness: CWE-20

Description

An issue was discovered in lib/Server.js in webpack-dev-server before 3.1.6. 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://127.0.0.1:8080/ connection from any origin.

Affected products

• webpack-dev-server: before 3.1.6 — fixed in 3.1.6

How to fix

Upgrade to a fixed version: webpack-dev-server 3.1.6. Check the vendor advisory for mitigations.

References

• https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20Messages
• https://github.com/webpack/webpack-dev-server/commit/f18e5adf123221a1015be63e1ca2491ca45b8d10
• https://github.com/webpack/webpack-dev-server/issues/1445
• https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20Messages
• https://github.com/webpack/webpack-dev-server/commit/f18e5adf123221a1015be63e1ca2491ca45b8d10
• https://github.com/webpack/webpack-dev-server/issues/1445

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