Security Advisory

CVE-2026-34226

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-03-27 21:17:24

Last updated 2026-03-31 14:25:27

Assigner GitHub_M

State PUBLISHED

Description

Happy 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.

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