CVE-2026-54264 angular CVE debrief

Who should care

Developers and administrators using the Angular framework, particularly those using the @angular/service-worker package, should be aware of this vulnerability. The vulnerability allows a remote attacker to obtain sensitive credentials, making it a high-priority issue to address. Affected versions include those prior to 22.0.1, 21.2.17, and 20.3.25.

Technical summary

The @angular/service-worker package in the Angular framework has an information disclosure vulnerability, CVE-2026-54264. When the Service Worker fetches assets, it preserves metadata 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 by triggering a cross-origin redirect to an untrusted external origin. The vulnerability is fixed in 22.0.1, 21.2.17, and 20.3.25.

Defensive priority

High priority should be given to updating the @angular/service-worker package to a fixed version (22.0.1, 21.2.17, or 20.3.25) to prevent exploitation of this vulnerability. Developers and administrators should review their dependencies and update them accordingly.

Recommended defensive actions

• Update the @angular/service-worker package to version 22.0.1, 21.2.17, or 20.3.25.
• Review and update dependencies to ensure that all affected versions are addressed.
• Monitor for potential exploitation attempts and review logs for suspicious activity.
• Consider implementing additional security measures, such as validating and sanitizing user input.
• Keep the Angular framework and its dependencies up to date with the latest security patches.

Evidence notes

The CVE-2026-54264 vulnerability is documented in the official CVE record and the NVD detail page. The vulnerability is caused by the Service Worker's failure to strip sensitive headers on cross-origin redirects, allowing a remote attacker to obtain sensitive credentials. The issue is fixed in 22.0.1, 21.2.17, and 20.3.25.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.