CVE-2026-49455 Details
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.
A cross-origin request forgery (CSRF) vulnerability has been identified in Waku, a minimal React framework, prior to version 1.0.0-beta.1. The issue arises because the framework's React Server Components (RSC) request dispatcher does not validate the 'Origin' or 'Sec-Fetch-Site' headers before invoking server actions. This lack of validation allows a cross-origin web attacker to manipulate a victim's browser into sending an authenticated POST request to a server action endpoint, using a CORS-safelisted content type, 'text/plain', which bypasses preflight checks. As a result, any state-mutating server action exposed via 'use server' can be executed with the victim's cookies. The vulnerability has been demonstrated with a proof-of-concept that successfully exploits Waku version 1.0.0-beta.0.
Users can update to Waku version 1.0.0-beta.1 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 3, 2026CISA-ADP
Assessed Sep 3, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1 | [email protected] | Release NotesVendor |
| https://github.com/wakujs/waku/security/advisories/GHSA-75w3-gmqx-993q | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-352 | Cross-Site Request Forgery (CSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Waku | <= 1.0.0-beta.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 3, 2026 | New CVE Received | [email protected] |
| Sep 3, 2026 | CVE Modified | CISA-ADP |