HIGH 8.6 NVD
CVE-2026-118660
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 21.0.0, Happy DOM loads iframe src URLs and link rel="s
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 21.0.0, Happy DOM loads iframe src URLs and link rel="stylesheet" href URLs by default while parsing untrusted HTML on the server because disableIframePageLoading and disableCSSFileLoading default to false. An attacker who controls parsed HTML can therefore cause server-side requests to arbitrary internal or cloud endpoints without an application opt-in and may expose confidential responses or credentials returned by those endpoints. This issue is fixed in version 21.0.0.
References
- https://github.com/capricorn86/happy-dom/commit/0a99c7525a1d0043e3182843ae33466ab7b19e74
- https://github.com/capricorn86/happy-dom/pull/2502
- https://github.com/capricorn86/happy-dom/releases/tag/v21.0.0
- https://github.com/capricorn86/happy-dom/security/advisories/GHSA-c8p4-j97h-3vg8
This high severity vulnerability with a CVSS score of 8.6 was published on 2026-10-28 via NVD.
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