CVE-2026-21877: critical vulnerability in n8n-io n8n
n8n is vulnerable to Remote Code Execution via Arbitrary File Write
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
43Vexday Risk Score
Patch soon. It has a working public exploit.
ssvc Attendcvss 10epss 5.4%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
n8n-io · n8nRelated CVEs — n8n-io n8n
In the same product, most dangerous first.
CVE-2025-68613CRITICALn8n Vulnerable to Remote Code Execution via Expression InjectionEPSS 99.0%KEVCVE-2026-21858CRITICALn8n Vulnerable to Unauthenticated File Access via Improper Webhook Request HandlingEPSS 78.2%CVE-2025-68668CRITICALn8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code NodeEPSS 13.2%CVE-2026-27577CRITICALn8n: Expression Sandbox Escape Leads to RCEEPSS 10.7%CVE-2026-25055HIGHn8n Arbitrary File Write on Remote Systems via SSH NodeEPSS 1.9%CVE-2026-25049CRITICALn8n Has an Expression Escape Vulnerability Leading to RCEEPSS 1.6%