{"id":"CVE-2026-49455","aliases":["GHSA-75w3-gmqx-993q"],"url":"https://o3.security/vulnerability/CVE-2026-49455","summary":"Waku: Cross-Origin CSRF on RSC Server Action Dispatch","details":"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.","published":"2026-09-03T18:15:42.014Z","modified":"2026-09-05T03:48:02.012205602Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},"epss":{"score":0.00119,"percentile":0.02,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"waku","fixedVersion":"1.0.0-beta.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49455.json"},{"type":"ADVISORY","url":"https://github.com/wakujs/waku/security/advisories/GHSA-75w3-gmqx-993q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49455"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-05T03:48:02.012205602Z"}}