{"id":"CVE-2026-54303","title":"n8n: Reflected XSS via Facebook, WhatsApp, and Microsoft Teams Trigger Webhook Verification Endpoints","summary":"n8n: Reflected XSS via Facebook, WhatsApp, and Microsoft Teams Trigger Webhook Verification Endpoints","severity":"medium","cvss":7.6,"cwe":["CWE-79"],"vendor":"n8n","product":"n8n","ecosystem":"npm","affected":["n8n < 2.24.0"],"patched":["n8n 2.24.0"],"published":"2026-06-16","updated":"2026-06-16","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-h86q-fx34-gfjr","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-h86q-fx34-gfjr"},{"url":"https://github.com/advisories/GHSA-h86q-fx34-gfjr"}],"tags":["ghsa","npm"],"epss":0.00231,"epssPercentile":0.14202,"ingestedAt":"2026-06-29T14:31:47.476Z","slug":"CVE-2026-54303","body":"## Overview\n\n## 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.\n\n## Affected packages\n\n- `n8n < 2.24.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `n8n 2.24.0`","depth":"sunlit","depthScore":42,"depthScoreParts":{"impact":41.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}