Cloudanix VulnDB

CVE-2026-50556

Medium · 6.1

CVSS

6.1

EPSS

0.4%

Published

Jun 22, 2026

CISA due date

—

The record

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.16, 20.3.24, and 19.2.25, a Cross-Site Scripting (XSS) vulnerability exists in @angular/platform-server's DOM emulation dependency (domino) when serializing the content of <noscript> elements. When rendering dynamic text content inside a <noscript> element via template bindings (such as {{ value }} or [textContent]), the template engine expects the browser to render the content safely. Under Server-Side Rendering (SSR), domino is configured with scripting enabled, meaning <noscript> is treated as a raw-text element. However, domino's serializer completely omitted <noscript> from the list of raw-text elements requiring closing-tag escaping during DOM serialization. As a result, any occurrence of </noscript> in the bound dynamic text was never escaped under any circumstances. The unescaped closing tag was serialized directly into the output HTML (e.g. <noscript></noscript><script>alert(1)</script></noscript>). When parsed by a browser, it closes the <noscript> block early, allowing the injected <script> block to execute in the user's browser context, causing same-origin Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.16, 20.3.24, and 19.2.25.

Affected packages

Ecosystem Package Introduced Fixed
npm @angular/platform-server 0 No fix
npm @angular/platform-server 19.0.0-next.0 19.2.25
npm @angular/platform-server 20.0.0-next.0 20.3.24
npm @angular/platform-server 21.0.0-next.0 21.2.16
npm @angular/platform-server 22.0.0-next.0 22.0.0-rc.2

Related vulnerabilities