CVE-2026-21858 CRITICAL

CVE-2026-21858: n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

Vendor N8N-Io
Product n8n
Weakness CWE-20 · Input validation
Published January 7, 2026
Last update January 12, 2026

CVSS base score

10.0/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 7, 2026 CVE published
January 12, 2026 Record updated