Expression Injection Vulnerability in n8n Open Source Workflow Automation Platform
CVE-2026-27493

9.5CRITICAL

Key Information:

Vendor

N8n-io

Status
N8n
Vendor
CVE Published:
25 February 2026

What is CVE-2026-27493?

The n8n platform contains a second-order expression injection vulnerability within its Form nodes. This issue allows an unauthenticated attacker to submit specially crafted form data that can inject and evaluate arbitrary n8n expressions. If combined with a sandbox escape, it could lead to remote code execution on the host system. The vulnerability arises when a form node's field value, prefixed with an = character, is treated as an expression, resulting in a double-evaluation of the data. Although the conditions required for exploitation are quite specific, this vulnerability underscores the need for careful handling of user input in workflow design. Administrators are advised to upgrade to patched versions or implement temporary mitigations while maintaining awareness of the risks involved.

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Affected Version(s)

n8n < 1.123.22 < 1.123.22

n8n >= 2.0.0, < 2.9.3 < 2.0.0, 2.9.3

n8n >= 2.10.0, < 2.10.1 < 2.10.0, 2.10.1

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-75...
x_refsource_CONFIRM
https://github.com/n8n-io/n8n/issues/19
x_refsource_MISC
https://github.com/n8n-io/n8n/commit/562d867483e871b0f1e3...
x_refsource_MISC

CVSS V4

Score:
9.5
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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