CVE-2026-54303Medium· 7.6▾ Sunlitn8n: Reflected XSS via Facebook, WhatsApp, and Microsoft Teams Trigger Webhook Verification Endpoints
▾ Sunlit zone — Low / medium · no exploitation signal
impact 41.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.2%
0.2% → 0.2%
An 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.
The issue has been fixed in n8n version 2.24.0. Users should upgrade to this version or later to remediate the vulnerability.
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
n8n-nodes-base.facebookTrigger, n8n-nodes-base.whatsAppTrigger, n8n-nodes-base.facebookLeadAdsTrigger, and n8n-nodes-base.microsoftTeamsTrigger to the NODES_EXCLUDE environment variable.These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
n8n < 2.24.0Upgrade to a patched release:
n8n 2.24.0Connected by shared product, vendor, weakness, or advisory.
GHSA-h5xr-fqvj-253pHighDuplicate Advisory: Stored DOM XSS via Resource Locator `cachedResultUrl`
GHSA-vhcw-f978-xjjgHighDuplicate Advisory: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview
CVE-2026-65597Highn8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview
CVE-2026-65592Highn8n: Stored DOM XSS via Resource Locator `cachedResultUrl`
CVE-2026-54301High· 7.6n8n: Same-Origin XSS in Respond to Webhook Node
CVE-2026-54302High· 7.6n8n: Stored XSS in Chat Trigger Node