Angular Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2026-50556 - Vulnerability Database

Angular

Angular Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2026-50556

Medium

Reference: CVE-2026-50556

NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2026-50556

Title: Angular Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability

Overview:

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-server39s DOM emulation dependency (domino) when serializing the content of ltnoscriptgt elements. When rendering dynamic text content inside a ltnoscriptgt 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 ltnoscriptgt is treated as a raw-text element. However domino39s serializer completely omitted ltnoscriptgt from the list of raw-text elements requiring closing-tag escaping during DOM serialization. As a result any occurrence of lt/noscriptgt in the bound dynamic text was never escaped under any circumstances. The unescaped closing tag was serialized directly into the output HTML (e.g. ltnoscriptgtlt/noscriptgtltscriptgtalert(1)lt/scriptgtlt/noscriptgt). When parsed by a browser it closes the ltnoscriptgt block early allowing the injected ltscriptgt block to execute in the user39s 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.