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.

According to its self-reported version number, Angular is prior to 19.0.0, 19.x prior to 19.2.25, 20.x prior to 20.3.24 or 21.x prior to 21.2.16. It is, therefore, affected by multiple vulnerabilities:

- A Cross-Site Scripting (XSS) vulnerability in the DOM emulation dependency (domino) of @angular/platform-server. A Unicode index alignment bug in the raw-text element escaping logic allows a payload containing an astral character followed by a closing tag (such as </script>) to remain unescaped in the SSR output. (CVE-2026-50555)

- A Cross-Site Scripting (XSS) vulnerability in the DOM emulation dependency (domino) of @angular/platform-server. The content of <noscript> elements is not escaped during SSR serialization, allowing an injected </noscript> closing tag to break out of the element and execute a script. (CVE-2026-50556)

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-50556)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-50556)

ID	Name	Product	Family	Type	Severity
115604	Angular < 19.2.25 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	Version Based	high
115603	Angular 19.x < 19.2.25 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	Version Based	high
115602	Angular 20.x < 20.3.24 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	Version Based	high
115601	Angular 21.x < 21.2.16 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	Version Based	high
322229	Linux Distros Unpatched Vulnerability : CVE-2026-50556	Nessus	Misc.	Local	high
443197	SCA: security update for @angular/platform-server (GHSA-gxx4-3xcv-f8qx)	Tenable Cloud Security	SCA Checks	Local	high
443197	SCA: security update for @angular/platform-server (GHSA-gxx4-3xcv-f8qx)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-50556

high

Tenable Plugins

high

high

high

high

high

high

high