n8n: Same-Origin XSS in Respond to Webhook Node_CVE-2026-54301

7 / 10

HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Description

n8n is an open source workflow automation platform. Prior to 1.123.55, 2.25.7, and 2.26.2, an authenticated user with workflow edit access could configure a Respond to Webhook node to serve binary content with an attacker-controlled Content-Type. The binary response path bypassed the central Content-Security-Policy sandbox header, allowing a public webhook to execute JavaScript in the n8n origin when visited by an authenticated user, with access to that user's session. This vulnerability is fixed in 1.123.55, 2.25.7, and 2.26.2.

Basic Information

ID CVE-2026-54301

Source GitHub_M

Published Jun 23, 2026 at 15:44

Affected Product

Vendor n8n-io

Product n8n

Version < 1.123.55

Affected Versions n8n-io n8n < 1.123.55
n8n-io n8n >= 2.0.0-rc.0, < 2.25.7
n8n-io n8n >= 2.26.0, < 2.26.2

CWE Classification

CWE-79

References

github.com /n8n-io/n8n/security/advisories/GHSA-v733-mwr6-fgcm

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    "published": "2026-06-23T15:44:58.322Z",
    "modified": "2026-06-23T15:44:58.322Z",
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