n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the expression compiler sanitizer resolved through dynamically scoped this and did not reject reserved class member names. A class field named __sanitize could rebind the sanitizer and reach the Function constructor, enabling backend code execution and editor-preview JavaScript execution.
The affected AST hook is PrototypeSanitizer in packages/workflow/src/expression-sandboxing.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 3
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
N8n N8n
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*
|
— |
1.123.76
|
|
N8n N8n
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*
|
2.0.0
|
2.37.7
|
|
N8n N8n
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*
|
2.38.0
|
2.38.2
|
References 4
https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76
security-advisories@github.com
https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
security-advisories@github.com
https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2
security-advisories@github.com
https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx
security-advisories@github.com