Medium [CVE-2026-54264] @angular/service-worker: @angular/service-worker: Information Disclosure via unstripped sensitive headers on cross-origin redirects

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.

This Moderate information disclosure flaw in the Angular Service Worker could allow a remote attacker to obtain sensitive credentials by exploiting improper handling of cross-origin redirects. However, Red Hat JBoss Fuse is not affected by this vulnerability as the vulnerable code is not present in the product.

Red Hat severity: Moderate — CVSS 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N). Weakness: CWE-212.