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CVE-2026-56356

medium

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.

Vendor / product: N8n — n8n

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
5.4
5.4 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-06-30 23:17
Modified: 2026-10-29 19:17
NVD status: Analyzed
Last synced 11 hours ago
Verified against the source API 2026-10-29 19:22 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

n8n / n8n <1.123.27, ≥2.0.0 <2.13.3, 2.14.0

Weakness classification (CWE)

CWE-79

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279
Patch / mitigation: https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279

References

Data sources

NVD CVE API 2.0 — fetched 2026-10-29 19:22 UTC · record ↗

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