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

Quick assessment

Affected
wakujs waku
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Waku 是一个极简 React 框架。在 1.0.0-beta.1 版本之前，从 导出的 辅助函数（位于 第 156–161 行）会接受任意字符串，并将其原样反射到 HTTP 响应头中，且未进行 URL 校验、协议限制或仅限路径的约束。任何将该辅助函数用于接收用户可控输入的应用程序——这也是 JSDoc 和官方示例中推荐的自然用法——都可能受到开放重定向（open redirect）攻击。攻击者只需诱使受害者点击一个精心构造的链接，即可让浏览器静默重定向到任意外部域名，从而可能引发钓鱼攻击、凭据收割以及 OAut

CVSS 3.1 · Low

Possible ATT&CK Techniques 1 AI

T1566 · Phishing

Affected Version Matrix 1

VendorProduct Version RangeStatus
wakujs waku < 1.0.0-beta.1 affected
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I. Basic Information for CVE-2026-49456

Vulnerability Information
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Vulnerability Title
Waku: Open Redirect via `unstable_redirect` Helper
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wakujs waku < 1.0.0-beta.1 -

II. Public POCs for CVE-2026-49456

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III. Intelligence Information for CVE-2026-49456

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Patches & Fixes for CVE-2026-49456 (1)

Vendor Advisories for CVE-2026-49456 (1)

Vendor Pages for CVE-2026-49456 (1)

IV. Related Vulnerabilities

Same product: waku
Same vendor: wakujs
Same weakness: CWE-601

V. Comments for CVE-2026-49456

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