Is there a public exploit for CVE-2026-56356?

No public exploit for CVE-2026-56356 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-56356?

CVE-2026-56356 scores CVSS 5.1 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.25%.

What does CVE-2026-56356 affect?

CVE-2026-56356 affects n8n n8n. It is part of the AI and agent stack (n8n).

5.1 Medium

n8n contains a stored cross-site scripting vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the…

CVE-2026-56356

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.

Part of the AI stack

This affects n8n, in Agent frameworks.

Assessment

CVSS: 5.1 (v4.0)
Severity: Medium
EPSS: 0.25% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 30 June 2026
Last updated: 29 October 2026
Affected: n8n · n8n
Weakness: CWE-79
Assigner: disclosure@vulncheck.com

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

At the source

References

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