CVE-2026-118660High· 8.6▾ TwilightHappy 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 be…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 47.3 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.4%
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.
happy-dom < 21.0.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
happy-dom <= 20.14.6Patched in:
happy-dom 21.0.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-118659High· 7.5@happy-dom/server-renderer: ServerRendererServer Target-Origin Bypass SSRF / Open Proxy
CVE-2026-115895High· 8.8Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution
CVE-2026-118661Medium· 6.5Happy DOM has cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies
CVE-2025-68616High· 7.5WeasyPrint helps web developers to create PDF documents
CVE-2025-61916High· 7.9Spinnaker is an open source, multi-cloud continuous delivery platform
CVE-2025-66201High· 8.1LibreChat is a ChatGPT clone with additional features