n8n-io n8n up to 1.123.54/2.25.6/2.26.1 webhookId cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in n8n-io n8n up to 1.123.54/2.25.6/2.26.1. This impacts an unknown function of the component webhookId Handler. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-54302. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in n8n-io n8n up to 1.123.54/2.25.6/2.26.1. It has been rated as problematic. This issue affects some unknown processing of the component webhookId Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

n8n is an open source workflow automation platform. Prior to 1.123.55, 2.25.7, and 2.26.2, an authenticated user with workflow edit access could inject arbitrary JavaScript into the Chat Trigger's generated page by setting a malicious webhookId. When a logged-in user visited the chat URL, the injected code executed in the n8n origin with that user's session privileges. This vulnerability is fixed in 1.123.55, 2.25.7, and 2.26.2.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-54302 since 06/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.123.55, 2.25.7 or 2.26.2 eliminates this vulnerability.

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Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 1.123.0
• 1.123.1
• 1.123.2
• 1.123.3
• 1.123.4
• 1.123.5
• 1.123.6
• 1.123.7
• 1.123.8
• 1.123.9
• 1.123.10
• 1.123.11
• 1.123.12
• 1.123.13
• 1.123.14
• 1.123.15
• 1.123.16
• 1.123.17
• 1.123.18
• 1.123.19
• 1.123.20
• 1.123.21
• 1.123.22
• 1.123.23
• 1.123.24
• 1.123.25
• 1.123.26
• 1.123.27
• 1.123.28
• 1.123.29
• 1.123.30
• 1.123.31
• 1.123.32
• 1.123.33
• 1.123.34
• 1.123.35
• 1.123.36
• 1.123.37
• 1.123.38
• 1.123.39
• 1.123.40
• 1.123.41
• 1.123.42
• 1.123.43
• 1.123.44
• 1.123.45
• 1.123.46
• 1.123.47
• 1.123.48
• 1.123.49
• 1.123.50
• 1.123.51
• 1.123.52
• 1.123.53
• 1.123.54
• 2.25.0
• 2.25.1
• 2.25.2
• 2.25.3
• 2.25.4
• 2.25.5
• 2.25.6
• 2.26.0
• 2.26.1

Website

• Product: https://github.com/n8n-io/n8n/

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