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VULNERABILITIES

CVE-2026-110842 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NDDVolerionCVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/n8n-io/n8n/security/advisories/GHSA-5jr4-xmvf-frmj [email protected]AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-via-mcp-workflow-validation-interpreter [email protected]Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')[email protected]

Affected Products

ProductVersions
n8n
< 2.41.4 (semver)
< 2.42.1 (semver)

CPE

  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*

Remediation

  • Upgrade: 2.41.4moderate effort
  • Upgrade: 2.42.1moderate effort
  • Mitigation:low effort

    Disable the instance-level MCP server if it is not required.

  • Mitigation:low effort

    Restrict n8n instance access to fully trusted users only.

  • Mitigation:low effort

    Enable MFA on all owner and admin accounts to prevent password-reset links from being usable even if obtained.

  • Mitigation:low effort

    Audit and revoke workflow:read MCP OAuth grants from any users who do not require them.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-110842
NVD Published Date:
Oct 14, 2026
NVD Last Modified:
Oct 15, 2026
Source:
[email protected]
CVE-2026-110842 Details - Not Deferred