CVE-2026-54306: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields could be surfaced and consumed as normal values by downstream built-in nodes. Where a workflow combines a public webhook with action nodes that consume the resulting fields, an attacker could cause the workflow to act as a confused deputy — targeting unintended records or issuing outbound requests using the workflow owner's configured credentials. This vulnerability is fixed in 2.25.7 and 2.26.2.
AI Analysis
Technical Summary
CVE-2026-54306 is a prototype pollution vulnerability in the n8n workflow automation platform. Specifically, in versions before 2.25.7 and 2.26.2, an attacker can send a crafted public webhook payload that injects malicious fields into internal workflow data during object copying. These attacker-controlled fields may be consumed by built-in nodes, enabling the workflow to act as a confused deputy. This could lead to unintended targeting of records or issuance of outbound requests using the workflow owner's credentials. The vulnerability is resolved in n8n versions 2.25.7 and 2.26.2.
Potential Impact
An attacker can exploit this vulnerability by sending specially crafted webhook payloads to inject malicious data into workflows. This can cause workflows to perform unauthorized actions, such as targeting unintended records or making outbound requests with the workflow owner's privileges. The impact is limited to workflows that combine public webhooks with action nodes that consume the injected fields. There are no known exploits in the wild as of the publication date.
Mitigation Recommendations
Upgrade n8n to version 2.25.7 or later, or 2.26.2 or later, where this prototype pollution vulnerability has been fixed. No other mitigation is indicated by the vendor advisory. Patch status is confirmed fixed in these versions.
CVE-2026-54306: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
Description
n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields could be surfaced and consumed as normal values by downstream built-in nodes. Where a workflow combines a public webhook with action nodes that consume the resulting fields, an attacker could cause the workflow to act as a confused deputy — targeting unintended records or issuing outbound requests using the workflow owner's configured credentials. This vulnerability is fixed in 2.25.7 and 2.26.2.
CVSS v4.0
Score 6.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54306 is a prototype pollution vulnerability in the n8n workflow automation platform. Specifically, in versions before 2.25.7 and 2.26.2, an attacker can send a crafted public webhook payload that injects malicious fields into internal workflow data during object copying. These attacker-controlled fields may be consumed by built-in nodes, enabling the workflow to act as a confused deputy. This could lead to unintended targeting of records or issuance of outbound requests using the workflow owner's credentials. The vulnerability is resolved in n8n versions 2.25.7 and 2.26.2.
Potential Impact
An attacker can exploit this vulnerability by sending specially crafted webhook payloads to inject malicious data into workflows. This can cause workflows to perform unauthorized actions, such as targeting unintended records or making outbound requests with the workflow owner's privileges. The impact is limited to workflows that combine public webhooks with action nodes that consume the injected fields. There are no known exploits in the wild as of the publication date.
Mitigation Recommendations
Upgrade n8n to version 2.25.7 or later, or 2.26.2 or later, where this prototype pollution vulnerability has been fixed. No other mitigation is indicated by the vendor advisory. Patch status is confirmed fixed in these versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-12T17:46:37.294Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3ab6daeed863c81e4f9f13
Added to database: 06/23/2026, 16:39:54 UTC
Last enriched: 06/30/2026, 22:57:45 UTC
Last updated: 08/05/2026, 12:41:16 UTC
Views: 59
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