n8n-io n8n up to 2.25.6/2.26.1 wrong session

Summaryinfo

A vulnerability labeled as problematic has been found in n8n-io n8n up to 2.25.6/2.26.1. This issue affects some unknown processing. Executing a manipulation can lead to wrong session. This vulnerability is registered as CVE-2026-54311. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in n8n-io n8n up to 2.25.6/2.26.1. This vulnerability affects an unknown part. The manipulation with an unknown input leads to a wrong session vulnerability. The CWE definition for the vulnerability is CWE-488. The product does not sufficiently enforce boundaries between the states of different sessions, causing data to be provided to, or used by, the wrong session. As an impact it is known to affect confidentiality. CVE summarizes:

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, an authenticated user with permission to create or modify workflows could pollute the sandbox used by the Merge node's SQL Query mode. Because the sandbox context was cached and reused across all workflow executions on the instance, prototype mutations introduced by one user's workflow persist into subsequent Merge SQL executions belonging to other users or projects. This allowed a low-privileged attacker to intercept workflow data processed by other users on the same instance. This issue only affects multi-user n8n instances where more than one user has permission to create and execute workflows containing the Merge node in SQL Query mode. This vulnerability is fixed in 2.25.7 and 2.26.2.

The advisory is available at github.com. This vulnerability was named CVE-2026-54311 since 06/12/2026. The exploitation appears to be difficult. The attack can be initiated remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 2.25.7 or 2.26.2 eliminates this vulnerability.

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Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 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/

CPE 2.3info

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CPE 2.2info

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