CVE-2026-59206: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
n8n, an open source workflow automation platform, contains a prototype pollution vulnerability (CWE-1321) in versions prior to 1.123.61, 2.27.4, and 2.28.1. An authenticated user with the default workflow:create permission could exploit this flaw by crafting a workflow that modifies Object.prototype via the workflow API. This allows unauthenticated requests to be treated as privileged users, exposing sensitive user and project listing endpoints. The issue is fixed in versions 1.123.61, 2.27.4, and 2.28.1.
AI Analysis
Technical Summary
CVE-2026-59206 describes a prototype pollution vulnerability in n8n before versions 1.123.61, 2.27.4, and 2.28.1. An authenticated user with workflow:create permission can craft workflows that pollute Object.prototype through the workflow API. This pollution enables unauthenticated requests to gain privileged access, exposing user and project listing endpoints. The vulnerability is addressed by fixes in the stated versions.
Potential Impact
The vulnerability allows privilege escalation from an authenticated user with limited permissions to effectively unauthenticated requests being treated as privileged users. This leads to unauthorized exposure of user and project listing endpoints, potentially disclosing sensitive information.
Mitigation Recommendations
A fix is available in n8n versions 1.123.61, 2.27.4, and 2.28.1. Users should upgrade to these versions or later to remediate this vulnerability. No vendor advisory is provided to indicate alternative mitigations or that no action is required.
CVE-2026-59206: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
Description
n8n, an open source workflow automation platform, contains a prototype pollution vulnerability (CWE-1321) in versions prior to 1.123.61, 2.27.4, and 2.28.1. An authenticated user with the default workflow:create permission could exploit this flaw by crafting a workflow that modifies Object.prototype via the workflow API. This allows unauthenticated requests to be treated as privileged users, exposing sensitive user and project listing endpoints. The issue is fixed in versions 1.123.61, 2.27.4, and 2.28.1.
CVSS v4.0
Score 7.1high
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-59206 describes a prototype pollution vulnerability in n8n before versions 1.123.61, 2.27.4, and 2.28.1. An authenticated user with workflow:create permission can craft workflows that pollute Object.prototype through the workflow API. This pollution enables unauthenticated requests to gain privileged access, exposing user and project listing endpoints. The vulnerability is addressed by fixes in the stated versions.
Potential Impact
The vulnerability allows privilege escalation from an authenticated user with limited permissions to effectively unauthenticated requests being treated as privileged users. This leads to unauthorized exposure of user and project listing endpoints, potentially disclosing sensitive information.
Mitigation Recommendations
A fix is available in n8n versions 1.123.61, 2.27.4, and 2.28.1. Users should upgrade to these versions or later to remediate this vulnerability. No vendor advisory is provided to indicate alternative mitigations or that no action is required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-02T21:05:02.924Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4fbf4868715ace439fdd9d
Added to database: 07/09/2026, 15:33:28 UTC
Last enriched: 07/09/2026, 15:47:42 UTC
Last updated: 07/09/2026, 16:23:36 UTC
Views: 6
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.