{"id":"GHSA-33q9-f52j-gc75","summary":"n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook","details":"## Impact\nThe `DELETE /${restEndpoint}/test-webhook/:id` route is registered before the authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. \n\nThe impact is limited to disrupting in-progress test sessions. Production webhooks, persistent workflow state, and stored data are not affected.\n\n## Patches\nUsers should upgrade to the patched version once available to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict network access to the n8n instance to fully trusted users only.\n- Place the n8n instance behind a reverse proxy or firewall that requires authentication before reaching the REST API.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","aliases":["CVE-2026-65014"],"modified":"2026-07-22T22:56:43.824898Z","published":"2026-07-22T22:36:10Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-07-22T22:36:10Z","nvd_published_at":null,"cwe_ids":["CWE-306"]},"references":[{"type":"WEB","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65014"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.27.4"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook"}],"affected":[{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.27.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-33q9-f52j-gc75/GHSA-33q9-f52j-gc75.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}