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="stylesheet" href URLs by default while parsing untrusted HTML on the server because disableIframePageLoading and disableCSSFileLoading...

GHSA-C8P4-J97H-3VG8 Happy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTML

Summary happy-dom v20.8.9 makes real server-side HTTP requests to arbitrary URLs when parsing HTML containing or elements. This behavior is enabled by default disableIframePageLoading: false, disableCSSFileLoading: false. When an application uses happy-dom to parse untrusted HTML on the server...

Happy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTML

Summary happy-dom v20.8.9 makes real server-side HTTP requests to arbitrary URLs when parsing HTML containing or elements. This behavior is enabled by default disableIframePageLoading: false, disableCSSFileLoading: false. When an application uses happy-dom to parse untrusted HTML on the server...

CVE-2026-118660 Happy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTML

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...

CVE-2026-118660 Happy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTML

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...

CVE-2026-118660 Happy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTML

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...

CVE-2026-118660

Prior to version 21.0.0 , the Happy DOM JavaScript library is vulnerable to Server-Side Request Forgery (SSRF) . The root cause is that the library defaults disableIframePageLoading and disableCSSFileLoading to false, causing it to automatically load iframe src and link rel="stylesheet" URLs when...

David Ortner Happy DOM server-side request forgery vulnerability

David Ortner: Versions prior to Happy DOM 21.0.0 contain a server-side request forgery vulnerability. This vulnerability arises because, when parsing untrusted HTML on the server, the default behavior loads iframe src URLs and link rel="stylesheet" href URLs. This may lead to server-side request...

PT-2026-129180

Name of the Vulnerable Software and Affected Versions happy-dom versions prior to 21.0.0 Description Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. When parsing untrusted HTML on the server, the software loads iframe src URLs and link...