{"id":"CVE-2026-49456","aliases":["GHSA-43fc-v873-qw85"],"url":"https://o3.security/vulnerability/CVE-2026-49456","summary":"Waku: Open Redirect via `unstable_redirect` Helper","details":"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.","published":"2026-09-03T18:15:54.213Z","modified":"2026-09-05T03:48:02.012410819Z","cvss":{"score":3.1,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},"epss":{"score":0.003,"percentile":0.22316,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"waku","fixedVersion":"1.0.0-beta.1"}],"fix":{"url":"https://github.com/wakujs/waku/pull/2090","label":"wakujs/waku#2090"},"references":[{"type":"WEB","url":"https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49456.json"},{"type":"ADVISORY","url":"https://github.com/wakujs/waku/security/advisories/GHSA-43fc-v873-qw85"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49456"},{"type":"FIX","url":"https://github.com/wakujs/waku/pull/2090"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-05T03:48:02.012410819Z"}}