VULNERABILITY INTELLIGENCE

CVE-2026-34226

CVSS score7.5 HIGH
EPSS probability0.47%
CISA KEVNot currently listed
Published2026-03-27
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-201
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-201

Primary references