Vulnerability Report

CVE-2026-21877

RCE

Title: Authenticated RCE in n8n

RCE

Proof Of Concept

PoC Available for CVE-2026-21877

CWE Category CWE-94

Published Date Jan 08, 2026

Modified Date Jan 20, 2026

Exploit Status Available

Score 9.9 CVSS v3.1

Exploit Probability (EPSS)

5.26%

Vulnerability Summary

CVE-2026-21877: 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.

Impacted Vendors

n8n 1

Reference Links

https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6 https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263

CVSS v3.1

Source Entity [email protected]

Severity CRITICAL

9.9

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-21877 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/Ashwesker/Ashwesker-CVE-2026-21877

View Code

January 20, 2026 MODIFIED

Vulnerability data updated via NVD.

January 20, 2026 MODIFIED

Vulnerability data updated via NVD.

January 08, 2026 MODIFIED

Vulnerability data updated via NVD.

January 08, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.