{"id":"CVE-2026-34226","state":"PUBLISHED","title":"Happy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookies","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. 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