CVE-2026-33696

Published Mar 25, 2026

Last updated 5 months ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-33696 is identified as a prototype pollution vulnerability affecting n8n, an open-source workflow automation platform. This flaw specifically resides within the XML and GSuiteAdmin nodes of the platform. Prior to versions 2.14.1, 2.13.3, and 1.123.27, an authenticated user possessing permissions to create or modify workflows could exploit this vulnerability. By supplying specially crafted parameters as part of a node's configuration, an attacker could write controlled values onto `Object.prototype`. This prototype pollution could then be leveraged to achieve remote code execution on the n8n instance.

Description: n8n is an open source workflow automation platform. Prior to versions 2.14.1, 2.13.3, and 1.123.27, an authenticated user with permission to create or modify workflows could exploit a prototype pollution vulnerability in the XML and the GSuiteAdmin nodes. By supplying a crafted parameters as part of node configuration, an attacker could write attacker-controlled values onto `Object.prototype`. An attacker could use this prototype pollution to achieve remote code execution on the n8n instance. The issue has been fixed in n8n versions 2.14.1, 2.13.3, and 1.123.27. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations: Limit workflow creation and editing permissions to fully trusted users only, and/or disable the XML node by adding `n8n-nodes-base.xml` to the `NODES_EXCLUDE` environment variable. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Source: security-advisories@github.com
NVD status: Analyzed
Products: n8n

Risk scores

CVSS 4.0

Type: Secondary
Base score: 9.4
Impact score: -
Exploitability score: -
Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Severity: CRITICAL

CVSS 3.1

Type: Primary
Base score: 8.8
Impact score: 5.9
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Weaknesses

security-advisories@github.com: CWE-1321

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*",
            "matchCriteriaId": "C5E7FBA6-35F5-426D-8BAA-25C7913A966A",
            "versionEndExcluding": "1.123.27",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*",
            "matchCriteriaId": "8ACE2AF2-6C9A-41A8-9883-6F2149E24151",
            "versionEndExcluding": "2.13.3",
            "versionStartIncluding": "2.0.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:n8n:n8n:2.14.0:*:*:*:*:node.js:*:*",
            "matchCriteriaId": "22BDDF0A-0915-4FF2-920C-E75F2F2F677D",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.