{"id":"CVE-2026-65014","aliases":["GHSA-33q9-f52j-gc75"],"title":"n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook","summary":"n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook","severity":"medium","cwe":["CWE-306"],"vendor":"n8n","product":"n8n","ecosystem":"npm","affected":["n8n < 2.27.4"],"patched":["n8n 2.27.4"],"published":"2026-07-22","updated":"2026-07-22","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-33q9-f52j-gc75","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65014"},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.27.4"},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0"},{"url":"https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook"},{"url":"https://github.com/advisories/GHSA-33q9-f52j-gc75"}],"tags":["ghsa","npm"],"ingestedAt":"2026-07-22T23:07:32.605Z","epss":0.00334,"epssPercentile":0.26752,"slug":"CVE-2026-65014","body":"## Overview\n\n## 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.\n\n## Affected packages\n\n- `n8n < 2.27.4`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `n8n 2.27.4`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}