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CVE-2026-21858

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Date: January 7, 2026

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.

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2026-21858
https://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858
https://thehackernews.com/2026/01/critical-n8n-vulnerability-cvss-100.html
https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg
https://github.com/n8n-io/n8n
https://www.mend.io/vulnerability-database/CVE-2026-21858

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

Top Fix

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Upgrade Version

Upgrade to version n8n - 1.121.0;n8n - 1.121.0;https://github.com/n8n-io/n8n.git - n8n@1.121.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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