CVE-2026-54264 Angular: Sensitive Header Leakage on Cross-Origin Redirects in Angular Service Worker
Remote attackers can steal sensitive credentials like authorization tokens by triggering cross-origin redirects in the Angular Service Worker.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-54264?
CVE-2026-54264 is a high-severity vulnerability in angular, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-54264?
8 open source packages ship an affected version, including @angular/service-worker. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@angular/service-worker npm | All versions to 19.2.25 | None |
@angular/service-worker npm | All versions to 19.2.25 | None |
@angular/service-worker npm | From 20.0.0-next.0 | 20.3.25 |
@angular/service-worker npm | From 20.0.0-next.0 | 20.3.25 |
@angular/service-worker npm | From 21.0.0-next.0 | 21.2.17 |
@angular/service-worker npm | From 21.0.0-next.0 | 21.2.17 |
2 more packages
@angular/service-worker npm | From 22.0.0-next.0 | 22.0.1 |
@angular/service-worker npm | From 22.0.0-next.0 | 22.0.1 |
Products include Angular Angular.
How do I fix CVE-2026-54264?
Upgrade @angular/service-worker to a fixed version for your release line: 20.3.25, 21.2.17 or 22.0.1.
Is CVE-2026-54264 being exploited?
There is no known exploitation of CVE-2026-54264 in the wild and no public exploit code.
Other vulnerabilities in angular
- CVE-2026-68945 Angular: Cache-Key Ambiguity in HttpTransferCache Leading to Cross-Request Response Reuse and State Poisoning
- CVE-2026-46417 Angular: SSRF via Hostname Hijacking in @angular/platform-server
- CVE-2026-50168 Angular: URL Parser Differential in @angular/platform-server leading to SSRF Allowlist Bypass
- CVE-2026-54266 Angular: Weak 32-Bit Cache Key Hashing in `HttpTransferCache` Leading to Cross-Request Data Leakage and State Poisoning
- CVE-2026-41423 Angular: SSRF via protocol-relative and backslash URLs in Angular Platform-Server
Sources
Also known as DEBIAN-CVE-2026-54264, GHSA-qxh6-94w6-9r5p, UBUNTU-CVE-2026-54264.