Medium severity · published Jun 30, 2026
CVE-2026-56356
n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
n8n contains a stored cross-site scripting vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the sanitize-html library. Affected releases are those before 1.123.27, the 2.0.0 through 2.13.2 line, and 2.14.0 (fixed in 1.123.27, 2.13.3, and 2.14.1). An authenticated user with permission to create or modify workflows can inject JavaScript that bypasses sanitization, resulting in stored XSS against any user who visits the public chat page.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N8
n8n · n8n
before 1.123.27; 2.0.0-rc.0 before 2.13.3; 2.14.0 before 2.14.1; before 2.14.1; before 2.13.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56356
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56356
Mitigation
https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279
Third Party Advisory
https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-node-custom-css-field
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