CVE WatchJul 15, 2026

CVE-2026-34226

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Versions prior to 20.8.9 may attach cookies

CVSS

7.5

High

EPSS

0.5%

p37

KEV

—

Exploit Today

0-100

Published: Mar 27, 2026 · Last modified: Jul 15, 2026 · CWE-201 · CWE-359

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-06-302026-07-16

Technical 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.

Official references

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