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CVE-2026-21877

CriticalPublished

n8n is vulnerable to Remote Code Execution via Arbitrary File Write

Published: Jan 8, 2026
Updated: Jan 8, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

9.9/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

5.4%

Low · next 30 days

Percentile: 92.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-21877Exploit
Dockerized vulnerable lab environment with a Python-based network monitor and dedicated exploit script, enabling hands-on exploitation, privilege checks, and flag capture.
cve-2026-21877-rcePoC
Exploit code for CVE-2026-21877, a remote code execution vulnerability, providing proof-of-concept implementation for security testing.

Responsible use

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