Angular Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2026-50184

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2 21.2.15 20.3.22 and 19.2.23 an issue in the angular/service-worker package compromises the integrity of request-policy enforcement during request reconstruction. When the Angular Service Worker intercepts network requests for matched assets it reconstructs a new Request object using an internal helper function. During this reconstruction process the helper function strips explicit client-defined safety parameters: the credentials configuration (such as credentials: 39omit39) and the HTTP cache mode configuration (such as cache: 39no-store39). These are reverted back to standard browser-default parameters (credentials: 39same-origin39 and default HTTP cache properties). This causes the browser to include active credentials (such as cookies or Authorization headers) on outbound requests where the client-side developer explicitly instructed they should be omitted leading to potential session leaks. Additionally it causes private or non-cacheable resources to be cached by the service worker39s engine making private page states accessible or persistent inside the client39s local cache post-logout. This vulnerability is fixed in 22.0.0-rc.2 21.2.15 20.3.22 and 19.2.23.