Disclosed vulnerability
Zero-click unauthenticated RCE in n8n: a public contact form executes shell commands via Form node double-evaluation and a SpreadElement sandbox escape
AIR-2026-0068 AIR record · 2026-03-n8n-form-node-zero-click-rce
From the supporting source
Anyone who can reach a public multi-step form with an HTML rendering can execute shell commands on the server.pillar.security
The record
Disclosed
2026-03-11
Vendor
n8n
Product
n8n Form nodes (/form/* endpoints)
Risk domain
Access control and permissions › Credential theft
Also touches
Privilege escalation
System type
Generative model
Who acted
AI was the target — unauthenticated zero-click RCE via a public n8n form
Attack surface
Agent framework
Autonomy level
Semi-autonomous
Initial vector
Unauthenticated http post to public form
Impact type
Remote code execution, Credential theft, Cross tenant exposure
Confidence
High
Submitted by
EAI Internal
Crosswalk
- OWASP Agentic Top 10 (2026)
- ASI03 – Identity and Privilege Abuse
- MITRE ATLAS
- AML.T0012 – Valid Accounts
- NIST AI RMF
- MEASURE 2.7
- EU AI Act
- Article 13
- ISO/IEC
- TR 24028; 42001; 23894
- AIUC-1
- B. Security
- Scope
- tool failure
- Mitigation
- Use secure credential storage; Implement short-lived tokens.
- Taxonomy
- Enkrypt AI agent risk taxonomy · Black-Box Red Teaming of Agentic AI: A Taxonomy-Driven Framework for Automated Risk Discovery
Blast radius
50,000+ publicly exposed n8n forms
Capability abused
Defense & remediation
Recorded defense
expression compiler sandbox
Guardrail kinds
Sandbox isolation
Guardrail outcome
Silent
Fix shipped
n8n 2.10.1, 2.9.3 and 1.123.22, released 2026-02-25
Taxonomy & references
Curator notes
Pillar Security (Eilon Cohen). CVE-2026-27493 (CVSS 9.5, Form node double-evaluation) and CVE-2026-27577 (CVSS 9.4, SpreadElement sandbox escape). Exploitation is a single form submission plus one GET. Access to N8N_ENCRYPTION_KEY decrypts all stored AWS keys, DB passwords, OAuth tokens and API keys. Distinct from 2026-02-n8n-expression-sandbox-escape (that one requires an authenticated workflow author).
Supporting sources
Cite as
Enkrypt AI. "Zero-click unauthenticated RCE in n8n: a public contact form executes shell commands via Form node double-evaluation and a SpreadElement sandbox escape". AIR, AIR-2026-0068. https://agentincident.vercel.app/i/AIR-2026-0068/ (accessed 2026-10-19).