{"id":"CVE-2026-56360","aliases":["GHSA-38c7-23hj-2wgq"],"url":"https://o3.security/vulnerability/CVE-2026-56360","summary":"n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger","details":"## Impact\nAn attacker who knows the webhook URL of a workflow using the ZendeskTrigger node could send unsigned POST requests and trigger the workflow with arbitrary data. The node does not verify the HMAC-SHA256 signature that Zendesk attaches to every outbound webhook, allowing any party to inject crafted payloads into the connected workflow.\n\n## Patches\nThe issue has been fixed in n8n versions 2.6.2 and 1.123.18. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Restrict network access to the n8n webhook endpoint to known Zendesk IP ranges.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","published":"2026-07-08T13:49:03.453Z","modified":"2026-10-21T02:30:53.807835859Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"n8n","fixedVersion":"1.123.18"},{"ecosystem":"npm","name":"n8n","fixedVersion":"2.6.2"}],"fix":{"url":"https://github.com/n8n-io/n8n/commit/3839e310bd4c3002c646c363d1411916fa195151","label":"n8n-io/n8n@3839e31"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56360.json"},{"type":"ADVISORY","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56360"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktrigger"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/commit/3839e310bd4c3002c646c363d1411916fa195151"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/commit/c6520e4e87614fa60c9433e93019e211f19f65f9"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:30:53.807835859Z"}}