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Back to active CVEs
Medium · CVSS 5.1CVE-2026-56356

n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS FieldCVE-2026-56356

Answer in brief

CVE-2026-56356 records a Medium severity (CVSS 5.1) vulnerability in n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field. The current sources do not mark it as known exploited. The current feed maps n8n/n8n (generic), n8n/n8n (generic), n8n/n8n (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 30, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Jul 1, 2026Material review Oct 29, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.1
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n8n/n8n (generic), n8n/n8n (generic), n8n/n8n (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:n8n:n8n:2.14.0:*:*:*:*:node.js:*:*Not reportedNot reported
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
n8n/n8ngeneric>=0 <1.123.27 || >=2.0.0-rc.0 <2.13.3 || >=2.14.0 <2.14.11.123.27, 2.13.3, 2.14.1
n8n/n8ngeneric>=2.14.0 <2.14.12.14.1
n8n/n8ngeneric>=2.0.0-rc.0 <2.13.32.13.3

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for n8n/n8n, n8n/n8n, n8n/n8n.
  2. 2Review the reported fix. Update n8n/n8n to 1.123.27; n8n/n8n to 2.14.1; n8n/n8n to 2.13.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jun 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 1, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 29, 2026
References
2 linked sources
Open source record