RCE in N8n-io N8n
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…
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.053 (90.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- N8n-io N8n — versions < 1.121.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263 (x_refsource_CONFIRM)
- https://github.com/n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-21877?
- CVE-2026-21877 is a critical-severity vulnerability in N8n-io N8n, classified under Code Injection. CVSS score: 10.0/10. Published 2026-01-08.
- How severe is CVE-2026-21877?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-21877 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.