EUVD-2026-38754Severity by source
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
Low-privilege authenticated attacker stores payload affecting all form visitors (scope change); CSP limits confidentiality to non-cookie form data; no availability impact.
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
Lifecycle Timeline
3DescriptionCVE.org
n8n before 1.123.25 (1.x) and before 2.11.2 (2.x), with the fix also included in 2.12.0, contains a stored cross-site scripting vulnerability in the Form Trigger node's CSS sanitization that allows authenticated users to inject malicious scripts. Attackers with workflow creation permissions can inject XSS payloads that execute persistently for all form visitors, enabling form hijacking and phishing attacks.
AnalysisAI
Stored XSS in n8n's Form Trigger node allows any authenticated low-privilege user with workflow creation rights to inject persistent malicious scripts that execute for every visitor of a published form. Affects n8n 1.x before 1.123.25 and 2.x from 2.0.0-rc.0 before 2.11.2. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated n8n account with workflow creation or modification permissions (PR:L per CVSS 4.0 vector) - administrative privileges are not required, making any low-privilege internal user a potential threat actor. … 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 - score 5.1) accurately reflects the threat model: network-reachable with low complexity, but gated behind low-privilege authentication and requiring passive user interaction from form visitors. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated n8n user with workflow creation permissions opens or modifies a workflow containing a Form Trigger node and injects a JavaScript payload crafted to evade the flawed CSS sanitization routine. Once the workflow is published, every subsequent visitor who loads the form URL unknowingly executes the injected script in their browser, which silently redirects form submissions to an attacker-controlled endpoint or renders convincing phishing content - all while the victim interacts with what appears to be a legitimate n8n-hosted form. … |
| Remediation | Vendor-released patches are available: upgrade n8n to version 2.11.2 or 2.12.0 (for 2.x deployments) or to 1.123.25 (for 1.x deployments), as confirmed by GHSA-q4fm-pjq6-m63g at https://github.com/n8n-io/n8n/security/advisories/GHSA-q4fm-pjq6-m63g. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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