Vulnerability Description
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 Score
LOW
Related Weaknesses (CWE)
References
- https://github.com/wakujs/waku/pull/2090
- https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1
- https://github.com/wakujs/waku/security/advisories/GHSA-43fc-v873-qw85
FAQ
What is CVE-2026-49456?
CVE-2026-49456 is a vulnerability with a CVSS score of 3.1 (LOW). 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 arbi...
How severe is CVE-2026-49456?
CVE-2026-49456 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-49456?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.