CVE-2026-21858

CRITICAL10.0

n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

Published Jan 7, 2026

Modified 1 weeks ago

Details

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.

References

WEBhttps://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-21858 WEBhttps://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858

CVSS Analysis

CVSS v3.1

10.0

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

ChangedS:C

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

NoneA:N

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

Weakness Type (CWE)

Input Validation

CWE-20

Improper Input Validation

Ecosystems

Timeline

PublishedJan 7, 2026

ModifiedJan 12, 2026