{"id":"GHSA-x8rx-789c-2pxq","summary":"RedwoodSDK has a CSRF vulnerability in server function dispatch via GET requests","details":"**Summary**\n\nServer functions exported from `\"use server\"` files could be invoked via GET requests, bypassing their intended HTTP method. In cookie-authenticated applications, this allowed cross-site GET navigations to trigger state-changing functions, because browsers send `SameSite=Lax` cookies on top-level GET requests.\n\nThis affected all server functions -- both `serverAction()` handlers and bare exported functions in `\"use server\"` files.\n\n**Impact**\n\nAn attacker could construct a URL containing a known action ID and JSON-encoded arguments. When a victim with an active session visited or was redirected to this URL, the function executed with the victim's credentials. This affected any server function that performs state-changing operations (writes, deletes, mutations) in applications using cookie-based authentication.\n\n**Remediation**\n\nUpdate to rwsdk `1.0.6`. No application code changes are required.\n\nThe fix enforces the declared HTTP method at dispatch time. GET requests to server functions that require POST now return `405 Method Not Allowed`.","aliases":["CVE-2026-39371"],"modified":"2026-04-08T00:27:17.091327Z","published":"2026-04-08T00:12:06Z","database_specific":{"cwe_ids":["CWE-352"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-04-08T00:12:06Z","nvd_published_at":"2026-04-07T20:16:31Z"},"references":[{"type":"WEB","url":"https://github.com/redwoodjs/sdk/security/advisories/GHSA-x8rx-789c-2pxq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39371"},{"type":"PACKAGE","url":"https://github.com/redwoodjs/sdk"}],"affected":[{"package":{"name":"rwsdk","ecosystem":"npm","purl":"pkg:npm/rwsdk"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.0.0-beta.50"},{"fixed":"1.0.6"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.0.5","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-x8rx-789c-2pxq/GHSA-x8rx-789c-2pxq.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H"}]}