AI Threat Alert
CVE-2026-59206
HIGHn8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an authenticated user with the default workflow:create permission could pollute Object.prototype through a crafted workflow saved, updated, or imported via the workflow API, allowing unauthenticated requests...
Full CISO analysis pending enrichment.
How severe is it?
What should I do?
No patch available
Monitor for updates. Consider compensating controls or temporary mitigations.
Which compliance frameworks are affected?
Compliance analysis pending. Sign in for full compliance mapping when available.
Frequently Asked Questions
What is CVE-2026-59206?
n8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an authenticated user with the default workflow:create permission could pollute Object.prototype through a crafted workflow saved, updated, or imported via the workflow API, allowing unauthenticated requests to be treated as a privileged user and exposing user and project listing endpoints. This issue is fixed in versions 1.123.61, 2.27.4, and 2.28.1.
Is CVE-2026-59206 actively exploited?
No confirmed active exploitation of CVE-2026-59206 has been reported, but organizations should still patch proactively.
How to fix CVE-2026-59206?
No patch is currently available. Monitor vendor advisories for updates.
What is the CVSS score for CVE-2026-59206?
No CVSS score has been assigned yet.
What are the technical details?
Original Advisory
n8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an authenticated user with the default workflow:create permission could pollute Object.prototype through a crafted workflow saved, updated, or imported via the workflow API, allowing unauthenticated requests to be treated as a privileged user and exposing user and project listing endpoints. This issue is fixed in versions 1.123.61, 2.27.4, and 2.28.1.
Weaknesses (CWE)
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Primary
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'): The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
- [Implementation] By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
- [Architecture and Design] By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
Source: MITRE CWE corpus.