CVE-2026-21858 | n8n is an open source workflow automation platform. Versions… | CVSS 10.0 CRITICAL

Description

n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker, resulting in exposure of sensitive information stored on the system and may enable further compromise depending on deployment configuration and workflow usage. This issue is fixed in version 1.121.0.

Metadata

CVE ID: CVE-2026-21858
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-01-05 16:44 UTC
Published: 2026-01-07 23:57 UTC
Last updated: 2026-01-12 18:37 UTC
Primary CWE: CWE-20
CWE-20: Improper Input Validation
Vendor / Product: n8n-io / n8n
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
n8n-io	n8n	—	>= 1.65.0, < 1.121.0

Weakness (CWE)

CWE	Source	Description
CWE-20	cna	CWE-20: Improper Input Validation

CVSS scores (1)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

References (2)

https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg
https://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858 https://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858