N8n < 1.121.0 Remote Code Execution (Ni8mare)

critical Web App Scanning Plugin ID 115105

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Synopsis

N8n < 1.121.0 Remote Code Execution (Ni8mare)

Description

According to its banner, the version of n8n running on the remote host is before 1.121.0. It is, therefore, affected by an unauthentcated file access vulnerability which can leads to remote code execution.

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to n8n version 1.121.0 or later.

See Also

https://docs.n8n.io/release-notes/1-x/

https://github.com/advisories/GHSA-v4pr-fm98-w9pg

Plugin Details

Severity: Critical

ID: 115105

Type: remote

Family: Artificial Intelligence

Published: 1/8/2026

Updated: 1/8/2026

Scan Template: api, basic, full, pci, scan

Risk Information

VPR

Risk Factor: Critical

Score: 9.9

CVSS v2

Risk Factor: High

Base Score: 9.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-21858

CVSS v3

Risk Factor: Critical

Base Score: 10

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS Score Source: CVE-2026-21858

Vulnerability Information

CPE: cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 1/6/2026

Reference Information

CVE: CVE-2026-21858

CWE: 20

OWASP: 2010-A4, 2013-A4, 2017-A5, 2021-A3

WASC: Improper Input Handling

CAPEC: 10, 101, 104, 108, 109, 110, 120, 13, 135, 136, 14, 153, 182, 209, 22, 23, 230, 231, 24, 250, 261, 267, 28, 3, 31, 42, 43, 45, 46, 47, 473, 52, 53, 588, 63, 64, 67, 7, 71, 72, 73, 78, 79, 8, 80, 81, 83, 85, 88, 9

DISA STIG: APSC-DV-002560

HIPAA: 164.306(a)(1), 164.306(a)(2)

ISO: 27001-A.14.2.5

NIST: sp800_53-SI-10

OWASP API: 2019-API7, 2023-API8

OWASP ASVS: 4.0.2-5.1.3

PCI-DSS: 3.2-6.5