Happy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookies

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-34226
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-27 22:16:23 UTC
Updated2026-04-01 13:26:49 UTC
DescriptionHappy DOM is a JavaScript implementation of a web browser without its graphical user interface. Versions prior to 20.8.9 may attach cookies from the current page origin (`window.location`) instead of the request target URL when `fetch(..., { credentials: "include" })` is used. This can leak cookies from origin A to destination B. Version 20.8.9 fixes the issue.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.000320000 probability, percentile 0.091890000 (date 2026-04-01)

Problem Types: CWE-201 | CWE-359 | CWE-201 CWE-201: Insertion of Sensitive Information Into Sent Data | CWE-359 CWE-359: Exposure of Private Personal Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Capricorn86 Happy Dom All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Capricorn86 Happy-dom affected < 20.8.9 Not specified

References

ReferenceSourceLinkTags
github.com/capricorn86/happy-dom/pull/2117 [email protected] github.com Issue Tracking, Patch
github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g [email protected] github.com Exploit, Vendor Advisory
github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda... [email protected] github.com Patch
github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca6964... [email protected] github.com Patch
github.com/capricorn86/happy-dom/releases/tag/v20.8.9 [email protected] github.com Product, Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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