CVE-2026-54264
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
An information disclosure vulnerability exists in the @angular/service-worker package of Angular prior to versions 22.0.1, 21.2.17, and 20.3.25. When fetching assets, the Service Worker preserves sensitive headers (e.g., Authorization, Proxy-Authorization, session cookies) on cross-origin redirects, violating the Fetch redirect algorithm. A remote attacker can obtain these credentials by triggering a redirect to an untrusted external origin.
Risk Assessment
The organization risks exposure of sensitive user credentials, potentially leading to unauthorized system access and identity theft. The attack requires no user interaction beyond visiting a crafted page.
Recommendation
Immediately update Angular to version 22.0.1, 21.2.17, or 20.3.25 depending on your branch. If an update is not feasible, consider temporarily disabling the Service Worker for sensitive resources.
Other vulnerabilities in @angular/service-worker
See all- CVE-2026-50184Medium
A vulnerability in the @angular/service-worker package strips explicit security parameters (credentials and cache mode) during request reconstruction by the Angular Service Worker. This causes the browser to include active credentials where they should be omitted and caches private resources locally, leading to potential session leaks and persistent private data.
- CVE-2026-50169Medium
A vulnerability in the @angular/service-worker package causes the Service Worker to strip strict redirect policies (e.g., redirect: 'error') during request reconstruction, falling back to the browser's default 'follow' behavior. This can lead to unintended following of HTTP 3xx redirects, potentially exposing cookies, credentials, or session-restricted data.
Original NVD description (English source)
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.