Is CVE-2026-118660 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-118660?

CVE-2026-118660 has a CVSS v3 severity of HIGH (8.6).

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CVE-2026-118660

Description

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.