Answer in brief
CVE-2026-50556 records a High severity (CVSS 8.6) vulnerability in @angular/platform-server: Missing `<noscript>` Raw-Text Serialization Escaping leads to Cross-Site Scripting (XSS) in Angular SSR. The current sources do not mark it as known exploited. The current feed maps @angular/platform-server (npm), @angular/platform-server (npm), @angular/platform-server (npm), @angular/platform-server (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps @angular/platform-server (npm), @angular/platform-server (npm), @angular/platform-server (npm), @angular/platform-server (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| @angular/platform-servernpm | <=18.2.14 | Not reported |
| @angular/platform-servernpm | >=22.0.0-next.0,<22.0.0-rc.2 | 22.0.0-rc.2 |
| @angular/platform-servernpm | >=22.0.0-next.0 <22.0.0-rc.2 | 22.0.0-rc.2 |
| @angular/platform-servernpm | >=21.0.0-next.0,<21.2.16 | 21.2.16 |
| @angular/platform-servernpm | >=20.0.0-next.0,<20.3.24 | 20.3.24 |
| @angular/platform-servernpm | >=19.0.0-next.0,<19.2.25 | 19.2.25 |
| @angular/platform-servernpm | >=22.0.0-next.0<22.0.0-rc.2 | Not reported |
| @angular/platform-servernpm | >=21.0.0-next.0<21.2.16 | Not reported |
| @angular/platform-servernpm | >=20.0.0-next.0<20.3.24 | Not reported |
| @angular/platform-servernpm | >=19.0.0-next.0<19.2.25 | Not reported |
| @angular/platform-servernpm | >=21.0.0-next.0 <21.2.16 | 21.2.16 |
| @angular/platform-servernpm | >=20.0.0-next.0 <20.3.24 | 20.3.24 |
| @angular/platform-servernpm | >=19.0.0-next.0 <19.2.25 | 19.2.25 |
| @angular/platform-servernpm | >=0 | Not reported |
Published upstream
Jun 2, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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). ### Impact This vulnerability allows an attacker to perform same-origin Cross-Site Scripting (XSS) attacks against any user visiting an SSR-rendered page that binds user-controlled data inside a `<noscript>` element. This can lead to session hijacking, credentials theft, unauthorized actions on behalf of users, and defacement. ### Patched Versions - 22.0.0-rc.2 - 21.2.16 - 20.3.24 - 19.2.25 ### Workarounds If you cannot immediately update your dependencies, you can: - Avoid binding user-controlled values inside `<noscript>` elements. - Sanitize any user input placed inside `<noscript>` to explicitly strip closing `</noscript>` tags before passing it to the template. ### References - https://github.com/angular/angular/issues/68903 - https://github.com/angular/domino/pull/29
Quoted source text, attributed separately from HOL analysis.