{"cve":"CVE-2026-49455","nvd":{"published":"2026-09-03T19:17:28.100","modified":"2026-09-09T20:20:21.673","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","score":6.5},"cwes":["CWE-352"],"references":["https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1","https://github.com/wakujs/waku/security/advisories/GHSA-75w3-gmqx-993q"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-49455","score":0.00174,"percentile":0.0681,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-75w3-gmqx-993q","url":"https://osv.dev/vulnerability/GHSA-75w3-gmqx-993q","summary":"Waku: Cross-Origin CSRF on RSC Server Action Dispatch","modified":"2026-07-08T20:56:35.443454Z","packages":[{"ecosystem":"npm","name":"waku","purl":"pkg:npm/waku","ranges":["<1.0.0-beta.1"],"fixed":["1.0.0-beta.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}