Vulnerability · Published Sep 3, 2026 · Assigned by GitHub_M
CVE-2026-49455Waku: Cross-Origin CSRF on RSC Server Action Dispatch
Medium 6.5
In plain English
A medium-severity cross-site request forgery in waku from wakujs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | waku | 1.0.0-beta.1 | GHSA-75w3-gmqx-993q |
Affected products (as reported)
Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
References
- https://github.com/wakujs/waku/security/advisories/GHSA-75w3-gmqx-993q x_refsource_CONFIRM
- https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1 x_refsource_MISC