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CVE-2018-14731

N/A
Published: September 21, 2018 at 05:00 PM UTC
Updated: June 17, 2026 at 01:41 AM UTC
1 product affected across 1 vendorParcel

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Severity
N/A
Exploit prediction
EPSS 2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Parcel· Parceljs
95%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20Messages
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/parcel-bundler/parcel/issues/1783
x_refsource_CONFIRMExploitPatchVendor Advisory
Source: [email protected]
https://github.com/parcel-bundler/parcel/pull/1794

CVSS

5MEDIUM[email protected]
Confidentiality
PARTIAL
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200

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