CVE-2026-54306: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
n8n versions prior to 2.25.7 and 2.26.2 contain a prototype pollution vulnerability that allows crafted public webhook payloads to inject attacker-controlled fields into workflow data. These malicious fields can be processed by downstream nodes, potentially causing workflows to perform unintended actions such as targeting incorrect records or making outbound requests with the workflow owner's credentials. The vulnerability is fixed in versions 2.25.7 and 2.26.2.
AI Analysis
Technical Summary
CVE-2026-54306 is a prototype pollution vulnerability in the open source workflow automation platform n8n. Before versions 2.25.7 and 2.26.2, an attacker could craft a public webhook payload that injects malicious fields into internal workflow data during object copying. These injected fields may be consumed by built-in nodes downstream, enabling the workflow to act as a confused deputy. This could lead to unintended record targeting or unauthorized outbound requests using the workflow owner's credentials. The issue is resolved in versions 2.25.7 and 2.26.2.
Potential Impact
An attacker can exploit this vulnerability by sending a specially crafted payload to a public webhook, causing the workflow to process attacker-controlled data. This may result in workflows performing unintended actions, such as modifying or targeting unintended records or issuing outbound requests with the workflow owner's privileges. This can lead to unauthorized actions within the affected system or connected services.
Mitigation Recommendations
This vulnerability is fixed in n8n versions 2.25.7 and 2.26.2. Users should upgrade to at least one of these versions to remediate the issue. Patch status is confirmed by the version information provided. No additional mitigation steps are indicated.
CVE-2026-54306: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
Description
n8n versions prior to 2.25.7 and 2.26.2 contain a prototype pollution vulnerability that allows crafted public webhook payloads to inject attacker-controlled fields into workflow data. These malicious fields can be processed by downstream nodes, potentially causing workflows to perform unintended actions such as targeting incorrect records or making outbound requests with the workflow owner's credentials. The vulnerability is fixed in versions 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 open source workflow automation platform n8n. Before versions 2.25.7 and 2.26.2, an attacker could craft a public webhook payload that injects malicious fields into internal workflow data during object copying. These injected fields may be consumed by built-in nodes downstream, enabling the workflow to act as a confused deputy. This could lead to unintended record targeting or unauthorized outbound requests using the workflow owner's credentials. The issue is resolved in versions 2.25.7 and 2.26.2.
Potential Impact
An attacker can exploit this vulnerability by sending a specially crafted payload to a public webhook, causing the workflow to process attacker-controlled data. This may result in workflows performing unintended actions, such as modifying or targeting unintended records or issuing outbound requests with the workflow owner's privileges. This can lead to unauthorized actions within the affected system or connected services.
Mitigation Recommendations
This vulnerability is fixed in n8n versions 2.25.7 and 2.26.2. Users should upgrade to at least one of these versions to remediate the issue. Patch status is confirmed by the version information provided. No additional mitigation steps are indicated.
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: 06/23/2026, 16:55:44 UTC
Last updated: 06/23/2026, 16:55:44 UTC
Views: 2
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