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CVE-2026-49455— Waku: Cross-Origin CSRF on RSC Server Action Dispatch

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 是一个极简的 React 框架。在 1.0.0-beta.1 版本之前，Waku 的 RSC 请求分发器在调用服务器动作（server actions）时，未验证请求的 （或 ）头信息。因此，跨域的 Web 攻击者可以诱使受害者浏览器向已注册的服务器动作端点发起带有认证的 POST 请求，且使用 CORS 安全列表中的内容类型（如 ），从而避免触发预检（preflight）请求。应用程序通过 暴露的任何具有状态变更能力的服务器动作，都可以在附带受害者 Cookie 的情况下被调用。该问题已在 1.0.0-

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
wakujs waku < 1.0.0-beta.1 affected
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I. Basic Information for CVE-2026-49455

Vulnerability Information
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Vulnerability Title
Waku: Cross-Origin CSRF on RSC Server Action Dispatch
Source: CVE Program / CVE List V5
Vulnerability Description
Waku is the minimal React framework. Prior to version 1.0.0-beta.1, Waku's RSC request dispatcher invokes server actions without validating the request's Origin (or Sec-Fetch-Site) header. A cross-origin web attacker can therefore cause a victim browser to issue an authenticated POST to a registered server action endpoint using a CORS-safelisted content type (text/plain), which does not trigger a preflight. Any state-mutating server action that the application exposes via 'use server' can be invoked with the victim's cookies attached. 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:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
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-2026-49455

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-49455

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Vendor Advisories for CVE-2026-49455 (1)

Vendor Pages for CVE-2026-49455 (1)

IV. Related Vulnerabilities

Same product: waku
Same vendor: wakujs
Same weakness: CWE-352

V. Comments for CVE-2026-49455

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