{"id":"CVE-2026-54303","aliases":["GHSA-h86q-fx34-gfjr"],"url":"https://o3.security/vulnerability/CVE-2026-54303","summary":"n8n: Reflected XSS via Facebook, WhatsApp, and Microsoft Teams Trigger Webhook Verification Endpoints","details":"## Impact\nAn endpoint in the Meta and Microsoft Teams trigger nodes reflects a query parameter into the HTTP response without sanitization or Content-Security-Policy headers, enabling reflected XSS in the n8n origin when a logged-in user visits a crafted URL.\n\n## Patches\nThe issue has been fixed in n8n version 2.24.0. Users should upgrade to this version 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 activation permissions to fully trusted users only.\n- Disable the affected nodes by adding `n8n-nodes-base.facebookTrigger`, `n8n-nodes-base.whatsAppTrigger`, `n8n-nodes-base.facebookLeadAdsTrigger`, and `n8n-nodes-base.microsoftTeamsTrigger` to the `NODES_EXCLUDE` environment variable.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","published":"2026-06-23T15:32:06.963Z","modified":"2026-10-28T02:31:03.586122195Z","cvss":null,"epss":{"score":0.00231,"percentile":0.13777,"asOf":"2026-09-01"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"n8n","fixedVersion":"2.24.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54303.json"},{"type":"ADVISORY","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-h86q-fx34-gfjr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54303"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:03.586122195Z"}}