https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-07T18:30:59.902816+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-363602 EUVD-2026-363602 2026-10-07T18:30:59.909759+00:00 EUVD-2026-363602 https://cve.radiocsirt.org/vuln/fkie_cve-2026-49455 fkie_cve-2026-49455 2026-10-07T18:30:59.909825+00:00

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.

 https://cve.radiocsirt.org/vuln/ghsa-75w3-gmqx-993q GHSA-75w3-gmqx-993q — Waku: Cross-Origin CSRF on RSC Server Action Dispatch 2026-10-07T18:30:59.909884+00:00

Affected: npm: waku

## Summary

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. A working proof-of-concept demonstrates the vulnerability against waku 1.0.0-beta.0 dev server: a cross-origin POST with `Content-Type: text/plain` invokes a registered `'use server'` action and returns HTTP 200 with an RSC stream response. The same defect affects the progressive-enhancement (no-JavaScript) server action path: a cross-origin HTML form auto-submitting `multipart/form-data` reaches the dispatch through a second unguarded branch of the request handler, dynamically confirmed on 2026-05-17. Both branches were confirmed exploitable from opaque-origin contexts (sandboxed iframes, `file://` navigation, browser extension pages), which send `Origin: null` — a value no Origin guard exists to reject. This is the same vulnerability class previously disclosed for Next.js Server Actions (GHSA-mq59-m269-xvcx); waku's implementation is broader in that no Origin check exists at all in the default request handler.

## Root cause

In `packages/waku/src/lib/utils/request.ts`:

```ts // line 2…