XSS in N8n
CVE-2026-27578
n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could inject arbitrary scripts into pages rendered by the n8n application using different techniques on various nodes (Form Trigger node, Chat Trigger node, Send & Wait node, Webhook Node, and Chat Node). Scripts injected by a malicious workflow execute in the browser of any user who visits the affected page, enabling session hijacking and account takeover. The issues have been fixed in n8n versions 2.10.1 and 1.123.21. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations. Limit workflow creation and editing permissions to fully trusted users only, and/or disable the Webhook node by adding `n8n-nodes-base.webhook` to the `NODES_EXCLUDE` environment variable. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- N8n
- N8n-Io N8n — versions < 1.123.22, >= 2.0.0, < 2.9.3, >= 2.10.0, < 2.10.1
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-2p9h-rqjw-gm92 (Vendor Advisory)
- github.com/n8n-io/n8n/commit/062644ef786b6af480afe4a0f12bc6d70040534a (Patch)
- github.com/n8n-io/n8n/commit/1479aab2d32fe0ee087f82b9038b1035c98be2f6 (Patch)
- github.com/n8n-io/n8n/commit/9e5212ecbc5d2d4e6f340b636a5e84be6369882e (Patch)
Frequently asked questions
- What is CVE-2026-27578?
- CVE-2026-27578 is a medium-severity vulnerability in N8n, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-25.
- How severe is CVE-2026-27578?
- Medium severity. CVSS v3 base score is 5.4 out of 10.