---
id: CVE-2026-49455
title: Waku is the minimal React framework
summary: >-
  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 …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'
cwe:
  - CWE-352
vendor: waku
product: waku
affected:
  - waku <= 1.0.0-beta.0
patched:
  - waku 1.0.0-beta.1
published: '2026-09-03'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:20:21.673'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49455'
references:
  - url: 'https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1'
    label: security-advisories@github.com
  - url: 'https://github.com/wakujs/waku/security/advisories/GHSA-75w3-gmqx-993q'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-75w3-gmqx-993q'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00119
epssPercentile: 0.02043
aliases:
  - GHSA-75w3-gmqx-993q
ecosystem: npm
ingestedAt: '2026-07-08T20:46:41.593Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-49455)

Affected packages:

- `waku <= 1.0.0-beta.0`

Patched in:

- `waku 1.0.0-beta.1`

Source: https://github.com/advisories/GHSA-75w3-gmqx-993q