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RCE via Arbitrary File Write

Critical
csuermann published GHSA-v364-rw7m-3263 Jan 6, 2026

Package

npm n8n (npm)

Affected versions

>= 0.123.0 < 1.121.3

Patched versions

1.121.3

Description

Impact

n8n is affected by an authenticated Remote Code Execution (RCE) vulnerability.

Under certain conditions, an authenticated user may be able to cause untrusted code to be executed by the n8n service. This could result in full compromise of the affected instance.

Both self-hosted and n8n Cloud instances are impacted.

Patches

The issue has been resolved in n8n version 1.121.3.

Users are advised to upgrade to this version or later to fully address the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators can reduce exposure by disabling the Git node and limiting access for untrusted users.

References

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVE ID

CVE-2026-21877

Weaknesses

Unrestricted Upload of File with Dangerous Type

The product allows the upload or transfer of dangerous file types that are automatically processed within its environment. Learn more on MITRE.

Credits