CVE-2026-21877

n8n is vulnerable to Remote Code Execution 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.

Affected

n8n-io · n8n

CVSS v3.1 GITHUB

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

EPSS

5.45% chance of exploitation in the next 30 days, 93rd percentile

Nuclei

critical · CWE-434

Published

2026-01-08

Proof-of-concept exploits (2)

• CVEs-Labs/CVE-2026-218770★ · 2026-08-13
• monkeontheroof/cve-2026-21877-rce0★ · 2026-04-26

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21877.yaml

Security advisories

• n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263
• advisories/GHSA-v364-rw7m-3263
• n8n-io/n8n/commit/f4b009d00d1f4ba9359b8e8f1c071e3d910a55f6

References

• CVE Record
• NVD entry

Related

• CVE-2026-1357
• CVE-2026-21876