CVE-2025-56648: parcel — Exploit

Description

npm parcel 2.0.0-alpha and before has an Origin Validation Error vulnerability. Malicious websites can send XMLHTTPRequests to the application's development server and read the response to steal source code when developers visit them.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-346 CWE-346

Affected Products

Vendor	Product	Versions
parceljs	parcel	< 1.10.3
parceljs	parcel	All

References

Exploits

https://gist.github.com/R4356th/41f468def606b2406e36f7193f5322b8 https://github.com/parcel-bundler/parcel/issues/10216

Other References

https://github.com/parcel-bundler/parcel/commit/4bc56e3242a85491c7edf589966e9b44c6330c49 https://github.com/parcel-bundler/parcel/discussions/10089

Frequently Asked Questions

What is CVE-2025-56648? +

npm parcel 2.0.0-alpha and before has an Origin Validation Error vulnerability. Malicious websites can send XMLHTTPRequests to the application's development server and read the response to steal source code when developers visit them. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-56648? +

CVE-2025-56648 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-56648? +

CVE-2025-56648 affects products from parceljs, specifically: parcel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-56648? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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