Angular Client Hydration DOM Clobbering & Response-Cache Poisoning

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.

Impact

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.

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.