CVE-2026-54267

To optimize client-side bootstrap in Server-Side Rendered (SSR) environments, Angular supports Hydration via provideClientHydration(). During SSR, Angular serializes the application's runtime state (such as cached HttpClient responses) and outputs it into the HTML stream as a <script> tag with a predictable identifier:

<script type="application/json" id="ng-state">
    {"some-api-url": {"body": ...}}
</script>

During client bootstrap, Angular recovers this state by looking up the element via document.getElementById('ng-state') and parsing its text content.

Because the DOM element lookup for the state container is predictable and relies solely on the ID selector (ng-state), it is susceptible to DOM Clobbering.

If the application binds untrusted user input or CMS content to element properties such as id (e.g., <div [id]="userInput"> or <a id="ng-state">) before the genuine <script> tag is parsed by the browser, the attacker-controlled element takes precedence in the DOM lookup.

During hydration, when Angular calls document.getElementById('ng-state'), the browser returns the attacker's clobbered element. Angular then attempts to parse the text content or attributes of this clobbered element as JSON.

Patched Versions

• 22.0.1
• 21.2.17
• 20.3.25

Workarounds

If you cannot immediately update to a patched Angular version, apply the following workarounds:

A. Avoid Dynamic/User-Controlled IDs

Avoid binding raw user-supplied values or dynamic CMS IDs directly to element attributes. If dynamic IDs are required, sanitize them or prepend a static safe prefix:

<!-- Vulnerable Pattern -->
<div [id]="userControlledInput">...</div>

<!-- Mitigated Pattern -->
<div [id]="'safe-prefix-' + userControlledInput">...</div>

B. Configure a Custom Application ID

Declaring a unique, non-predictable APP_ID changes the ID suffix of the state element, making it harder for attackers to predict and target:

// app.config.ts

import { APP_ID } from '@angular/core';
import { provideClientHydration } from '@angular/platform-browser';

export const appConfig = {
  providers: [
    { provide: APP_ID, useValue: 'unique-obfuscated-app-id' },
    provideClientHydration()
  ]
};

This changes the state element lookup ID from ng-state to unique-obfuscated-app-id-state.

By clobbering the state element, the attacker can inject a custom JSON payload into Angular's TransferState cache. The most critical exploitation vector is poisoning the HTTP Transfer Cache.

1. The attacker injects a clobbered ng-state element containing custom JSON.
2. The JSON maps a key (representing a target API endpoint URL) to a malicious payload of the attacker's choice.
3. During client-side initialization, Angular's HttpClient checks TransferState before making requests. Finding the poisoned key, HttpClient returns the forged response instantly instead of requesting the genuine backend API.

Depending on how the application processes and renders the affected API response, this can lead to:

• DOM-based Cross-Site Scripting (XSS) if poisoned fields are rendered using unsafe bindings.
• Privilege Escalation by spoofing user info or session details retrieved from poisoned API payloads.
• UI Hijacking and redirection by spoofing configuration endpoints.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

Kodem intelligence

1. What is CVE-2026-54267? CVE-2026-54267 is a high-severity cross-site scripting (XSS) vulnerability in @angular/core (npm), affecting versions >= 22.0.0-next.0, < 22.0.1. It is fixed in 22.0.1, 21.2.17, 20.3.25. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. Which versions of @angular/core are affected by CVE-2026-54267? @angular/core (npm) versions >= 22.0.0-next.0, < 22.0.1 is affected.
3. Is there a fix for CVE-2026-54267? Yes. CVE-2026-54267 is fixed in 22.0.1, 21.2.17, 20.3.25. Upgrade to this version or later.
4. Is CVE-2026-54267 exploitable, and should I be worried? Whether CVE-2026-54267 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether CVE-2026-54267 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix CVE-2026-54267?
   • Upgrade @angular/core to 22.0.1 or later
   • Upgrade @angular/core to 21.2.17 or later
   • Upgrade @angular/core to 20.3.25 or later