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n8n CVE-2026-56354

| EUVDEUVD-2026-42887 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-10 VulnCheck GHSA-qmq2-xjjf-5ffp
XSS Open Redirect 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:N/VI:N/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

PR:L reflects required workflow-creation authentication; S:C and UI:R capture downstream form-visitor impact; no availability impact applies.

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:N/VI:N/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:N/VI:N/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 10, 2026 - 16:16 EUVD
Analysis Generated
Jul 10, 2026 - 15:51 vuln.today

DescriptionCVE.org

n8n before 1.123.24, 2.10.4, and 2.12.0 (across its 1.x and 2.x branches) contains cross-site scripting and open redirect vulnerabilities in the Form Node due to unsanitized HTML description fields and overly permissive iframe sandbox policies. Authenticated users with workflow creation permissions can inject malicious scripts or redirect parameters to perform stored XSS attacks or phishing redirects against end users.

AnalysisAI

Stored cross-site scripting and open redirect vulnerabilities in n8n's Form Node allow authenticated users with workflow creation permissions to inject malicious scripts or phishing redirects that execute in the browsers of end users who interact with published forms. Affected across both the 1.x branch (before 1.123.24) and the 2.x branch (before 2.10.4 and 2.12.0). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain low-privilege n8n account
Delivery
Create or edit workflow with Form Node
Exploit
Inject XSS payload in HTML description field
Install
Publish form URL
C2
Victim loads form
Execute
Malicious script executes in victim browser
Impact
Exfiltrate data or redirect to phishing site
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated n8n account with workflow creation or editing permissions - anonymous or read-only access is insufficient. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.1 (AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N) accurately reflects the threat model: the impact is on subsequent-system users (form visitors), not the n8n instance itself, which is why VC/VI/VA are all N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a low-privileged n8n account (or one obtained through credential theft or insider access) creates or modifies a workflow containing a Form Node, embedding a JavaScript payload in the HTML description field. When an external end user accesses the published form URL, the unsanitized script executes in their browser, potentially stealing session cookies, credentials entered into the form, or silently redirecting the victim to a phishing page via the open redirect vector. …
Remediation Upgrade n8n to version 1.123.24 or later on the 1.x branch, or to 2.10.4 / 2.12.0 or later on the 2.x branch, per the vendor security advisory at https://github.com/n8n-io/n8n/security/advisories/GHSA-w673-8fjw-457c. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56354 vulnerability details – vuln.today
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