CVE-2026-21877

Name: CVE-2026-21877
Creator: NVD / NIST
Published: 2026-01-08T01:15:55.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 5.26%

Last modified Jun 17, 2026

CVE-2026-21877 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. 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. EPSS estimates a 5.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.9/10

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

EPSS Probability

5.26%

91.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
N8n	N8n	>= 0.123.0, < 1.121.3

References

Timeline

Published: Jan 8, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21877?

How severe is CVE-2026-21877?

CVE-2026-21877 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 5.26% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21877?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21877?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST