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n8n CVE-2026-56356

| EUVDEUVD-2026-40444 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-06-30 VulnCheck GHSA-99wx-hwrx-8g4w
XSS N8n
5.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.4 MEDIUM

Stored XSS exploitable over network by authenticated workflow editor (PR:L), requires victim page visit (UI:R), scope change (S:C) reflects cross-user impact; no availability impact.

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

2
Patch available
Jul 01, 2026 - 02:16 EUVD
Analysis Generated
Jun 30, 2026 - 23:35 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Stored XSS in n8n's Chat Trigger node allows authenticated workflow editors to inject JavaScript through a misconfigured sanitize-html filter in the Custom CSS field, which then executes in the browsers of every user visiting the public chat page. Affected are all 1.x releases before 1.123.27, the 2.0.0-2.13.2 range, and 2.14.0; fixed versions are 1.123.27, 2.13.3, and 2.14.1. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with workflow editor credentials
Delivery
Inject JavaScript into Chat Trigger Custom CSS field
Exploit
Payload stored server-side, bypassing sanitize-html
Execution
Victim visits public chat page URL
Persist
Injected script executes in victim browser
Impact
Session cookie or credential theft
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated n8n user account with permission to create or modify workflows - confirmed by the CVSS 4.0 PR:L metric. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:P) scores 5.1 (Medium). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a legitimate or compromised n8n account holding workflow editor permissions creates or edits a Chat Trigger workflow and places a malicious JavaScript payload in the Custom CSS field, bypassing the improperly configured sanitize-html filter. The payload is persisted server-side and rendered to every user who subsequently visits the public chat URL associated with that workflow. …
Remediation Upgrade n8n to version 1.123.27 (for the 1.x line), 2.13.3 (for the 2.13.x line), or 2.14.1 (for the 2.14.x line) as documented in the vendor advisory at https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56356 vulnerability details – vuln.today
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