CVE-2026-54311mediumCWE-488

CVE-2026-54311: medium-severity vulnerability in n8n-io n8n

n8n: Merge Node SQL Mode Prototype Pollution

Published

Follow this CVE+ Monitor n8n+ Monitor n8n

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6epss 0.4%
In short

A flaw in n8n's Merge node SQL mode allows an authenticated user to inject malicious code into a shared sandbox environment that persists across workflow executions. This lets attackers intercept and access data from other users' workflows on the same instance.

Technical detail

Prototype pollution vulnerability in n8n Merge node's SQL Query mode where cached sandbox context is reused across all workflow executions. An authenticated attacker with workflow creation permissions can mutate the prototype to persist malicious modifications, enabling unauthorized access to data processed by other users in subsequent executions on multi-user instances.

Summary generated and translated by AI from the official description.
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.
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Affected products
n8n-io · n8n
Related CVEs — n8n-io n8n

In the same product, most dangerous first.

CVE-2025-68613CRITICALn8n Vulnerable to Remote Code Execution via Expression InjectionEPSS 99.0%KEVCVE-2026-21858CRITICALn8n Vulnerable to Unauthenticated File Access via Improper Webhook Request HandlingEPSS 78.2%CVE-2025-68668CRITICALn8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code NodeEPSS 13.2%CVE-2026-27577CRITICALn8n: Expression Sandbox Escape Leads to RCEEPSS 10.7%CVE-2026-21877CRITICALn8n is vulnerable to Remote Code Execution via Arbitrary File WriteEPSS 5.4%CVE-2026-25055HIGHn8n Arbitrary File Write on Remote Systems via SSH NodeEPSS 1.9%