CVE-2026-21877

CRITICAL
2026-01-08 [email protected] GHSA-v364-rw7m-3263
9.9
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch Released
Jan 20, 2026 - 15:08 nvd
Patch available
CVE Published
Jan 08, 2026 - 01:15 nvd
CRITICAL 9.9

Tags

RCE Remote Code Execution Code Injection Node.js N8n

Description

n8n is an open source workflow automation platform. In versions 0.121.2 and below, an authenticated attacker may be able to execute malicious code using the n8n service. This could result in full compromise and can impact both self-hosted and n8n Cloud instances. This issue is fixed in version 1.121.3. Administrators can reduce exposure by disabling the Git node and limiting access for untrusted users, but upgrading to the latest version is recommended.

Analysis

n8n workflow automation (through 1.121.2) allows authenticated users to execute arbitrary code via the n8n service, with scope change enabling full compromise of both self-hosted and cloud instances. EPSS 12.5% indicates high exploitation activity. …

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Remediation

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Validate that input sanitization is in place for all user-controlled parameters.

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Priority Score

62
Low Medium High Critical
KEV: 0
EPSS: +12.5
CVSS: +50
POC: 0

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CVE-2026-21877 vulnerability details – vuln.today
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