CVE-2026-110842

7.7High

Published 14 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

7.7High

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-1321

Impact

Authenticated members with workflow:read access can take over owner accounts that lack MFA and gain full system control. Attackers need valid low-privileged credentials to reach the MCP workflow-validation tool.

Root cause

The MCP workflow-validation interpreter runs untrusted code in the main process and allows assignment onto shared JavaScript prototypes.

Affected systems

n8n before 2.41.4 and 2.42.x before 2.42.1

CVSS v4.0 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Fix & remediation

Upgrade to n8n 2.41.4, 2.42.1, or later. If upgrading must wait, enforce MFA on all owner accounts and restrict workflow:read access.

shell

$ npm install -g n8n@latest

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the MCP workflow-validation tool, whose interpreter evaluates caller-supplied code in the main process, reads inherited properties, and permits assignment onto shared prototypes. An authenticated member holding only a workflow:read grant can replace a built-in method with one returning a truthy value so server-side permission checks accept unheld scopes, enabling takeover of owner accounts not protected by MFA.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-110842