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CVE-2026-118661

CVE-2026-118661 · Happy DOM: Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 20.14.6, Happy DOM's CookieContainer in src/cookie/CookieContainer.ts does not correctly validate or match Domain cookie attributes. It can accept a Domain unrelated to the origin setting the cookie, including a public suffix, and separately treats an unrelated suffix-sharing hostname as a match because cookieMatchesURL does not enforce a DNS-label boundary. In server-side rendering and prerendering applications that contact attacker-controlled origins and then make requests to a victim origin, these behaviors can plant and deliver a forged cookie, enabling cookie injection or session fixation. This issue is fixed in version 20.14.6.

CVSS 6.5 · Medium · EPSS 0.3% · Public exploit · Fix available

Published
Updated

Stack: node

Affected products and versions

  • happy-dom

    Versions
    • < 20.14.6: Affected

    No fix published

  • happy-dom npm

    Affected ranges
    • SEMVER: < 20.14.6

    Update to 20.14.6

Original sources

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