Sandbox Escape Vulnerability in n8n Workflow Automation Platform
CVE-2026-77083

6MEDIUM

Key Information:

Vendor

N8n-io

Status
N8n
Vendor
CVE Published:
20 August 2026

What is CVE-2026-77083?

The n8n workflow automation platform has a vulnerability in its JavaScript Code node's VM sandbox that allows an authenticated user to manipulate the Function.prototype, leading to sandbox escape. This issue is present in versions before 1.123.69, 2.33.4, and 2.34.1. By exploiting this flaw, users can execute unauthorized actions and access the host's global context. Mitigation requires the latest updates to be installed to ensure a secure environment.

Affected Version(s)

n8n 0 < 1.123.69

n8n 2.34.0 < 2.34.1

n8n 2.0.0 < 2.33.4

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-c9...
vendor-advisory
https://www.vulncheck.com/advisories/n8n-before-code-node...
third-party-advisory

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

zolbooo
.