CVE-2026-49456

CVE-2026-49456 · Waku: Open Redirect via `unstable_redirect` Helper

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Waku is the minimal React framework. Prior to version 1.0.0-beta.1, the unstable_redirect() helper exported from waku/router/server (packages/waku/src/router/define-router.tsx:156–161) accepts an arbitrary string and reflects it unchanged into the HTTP Location response header with no URL validation, scheme restriction, or path-only enforcement. Any application that passes user-controlled input to this helper — the natural pattern documented in the JSDoc and official fixtures — is vulnerable to open redirect attacks. An attacker who convinces a victim to click a crafted link can silently redirect the browser to an arbitrary external domain, enabling phishing, credential harvesting, and OAuth token theft. Additionally, scheme-relative URLs (//evil.example/) bypass naive https?://-only allow-list filters that developers might add as ad-hoc mitigations. This issue has been patched in version 1.0.0-beta.1.

CVSS 3.1 · Low · EPSS 0.4% · Fix available

Published

2026-09-03T18:15:54.213Z

Updated

2026-09-03T18:29:02.239Z

Stack: node

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