Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.1, 21.2.17, and 20.3.25, an information disclosure vulnerability exists in the @angular/service-worker package of the Angular framework. When the Service Worker fetches assets, it preserves metadata (such as headers) from the original request. However, on cross-origin redirects, the Service Worker fails to strip sensitive headers, violating the Fetch redirect algorithm. This allows a remote attacker to obtain sensitive credentials (e.g., Authorization tokens, Proxy-Authorization credentials, or session cookies) by triggering a cross-origin redirect to an untrusted external origin. This vulnerability is fixed in 22.0.1, 21.2.17, and 20.3.25.

Affected: npm: @angular/service-worker

An information disclosure vulnerability exists in the `@angular/service-worker` package of the Angular framework. When the Service Worker fetches assets, it preserves metadata (such as headers) from the original request. However, on cross-origin redirects, the Service Worker fails to strip sensitive headers, violating the Fetch redirect algorithm.

This allows a remote attacker to obtain sensitive credentials (e.g., `Authorization` tokens, `Proxy-Authorization` credentials, or session cookies) by triggering a cross-origin redirect to an untrusted external origin.

### Impact If an application configured with the Angular Service Worker fetches assets with credential headers (such as `Authorization` header), and one of those requests is redirected to a different origin, the Service Worker will forward those headers to the new origin. This exposes critical credentials and session identifiers to unauthorized third-party servers.

### Attack Preconditions For this vulnerability to be exploitable: 1. **Vulnerable Configuration:** The application must utilize the `@angular/service-worker` package to fetch assets. 2. **Credentialed Requests:** The application must attach sensitive request headers (like `Authorization`, `Proxy-Authorization`, or rely on cookies) to asset-group requests. 3. **Redirect Flow:** These requests must encounter a cross-origin redirect to an attacker-controlled or untrusted domain.

### Patched Versions * 22.0.1 * 21.2.17 * 20.3.25

### Credits This vul…

Affected: Ubuntu:Pro:16.04:LTS: angular.js, Ubuntu:Pro:18.04:LTS: angular.js, Ubuntu:Pro:20.04:LTS: angular.js, Ubuntu:22.04:LTS: angular.js, Ubuntu:24.04:LTS: angular.js, Ubuntu:25.10: angular.js, Ubuntu:26.04:LTS: angular.js

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.1, 21.2.17, and 20.3.25, an information disclosure vulnerability exists in the @angular/service-worker package of the Angular framework. When the Service Worker fetches assets, it preserves metadata (such as headers) from the original request. However, on cross-origin redirects, the Service Worker fails to strip sensitive headers, violating the Fetch redirect algorithm. This allows a remote attacker to obtain sensitive credentials (e.g., Authorization tokens, Proxy-Authorization credentials, or session cookies) by triggering a cross-origin redirect to an untrusted external origin. This vulnerability is fixed in 22.0.1, 21.2.17, and 20.3.25.

Ein Angreifer kann mehrere Schwachstellen in Angular ausnutzen, um erweiterte Berechtigungen zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen, einen Denial-of-Service-Zustand herbeizuführen, Daten zu manipulieren oder offenzulegen, Benutzer auf bösartige Websites umzuleiten oder Sitzungen zu kapern.