GHSA-v364-rw7m-3263 · Severity: critical · Ecosystem: npm — n8n Vulnerable to RCE via Arbitrary File Write
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.
Conclusion & alert: CVE-2026-21877 is rated High Risk (72/100): CVSS Critical severity, with high exploitation likelihood (EPSS 5.90%, 91th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-05 | 5.26% | 5.90% | +0.64% |
| 2 | 2026-06-04 | 10.73% | 5.26% | -5.48% |
| 3 | 2026-05-18 | — | 10.73% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.9 | 3.1 | CRITICAL |
|
3.1 | 6.0 | [email protected] |
GHSA-v364-rw7m-3263 · Severity: critical · Ecosystem: npm — n8n Vulnerable to RCE via Arbitrary File Write