Threat Intelligence / CVE / CVE-2026-21877

CVE-2026-21877

CVSS 9.9 (CRITICAL) · EPSS 14.1% · Published 2026-01-08

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 v3 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-94, CWE-434

Threats tracking this CVE

n8n Multi-CVE Vulnerability Cascade — Expression Sandbox Escape, Pyodide RCE, Arbitrary File Write, Command Injection (9 CVEs, 2× CVSS 10.0) — CRITICAL

References

Full detection coverage & IOCs for threats exploiting CVE-2026-21877 are available via the Threadlinqs MCP server (Purple tier). View plans →

Markdown version · Threadlinqs Intelligence