CVE-2026-54264: Angular: Sensitive Header Leakage on Cross-Origin Redirects in Angular Service Worker

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-22 · updated 2026-07-09
Weakness: CWE-200

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.

Affected products

angular: through 19.2.25; from 20.0.0 before 20.3.25; from 21.0.0 before 21.2.17; from 22.0.0 before 22.0.1 — fixed in 20.3.25, 21.2.17, 22.0.1

How to fix

Upgrade to a fixed version: angular 20.3.25, 21.2.17, 22.0.1. Check the vendor advisory for mitigations.

References

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