CVE-2026-25049 is a critical security vulnerability identified in the open-source workflow automation platform n8n, specifically affecting versions prior to 1.123.17 and 2.5.2. The root cause is classified under CWE-913, which involves improper control of dynamically-managed code resources. In this case, an authenticated user with workflow creation or modification permissions can inject malicious expressions into workflow parameters. These crafted expressions are improperly sanitized or validated, allowing them to trigger unintended system command execution on the host machine running the n8n service. This means that an attacker who gains legitimate access to n8n with sufficient privileges can escalate their control to execute arbitrary commands at the system level, potentially leading to full compromise of the underlying server. The vulnerability does not require additional user interaction beyond authentication, and the attack vector is network-based, making remote exploitation feasible. The CVSS 4.0 base score of 9.4 reflects the critical nature of this flaw, highlighting its high impact on confidentiality, integrity, and availability, combined with low attack complexity and no need for user interaction. Although no known exploits have been reported in the wild yet, the availability of this information and the severity of the vulnerability necessitate immediate remediation. The vendor has addressed the issue in versions 1.123.17 and 2.5.2 by implementing proper controls to prevent malicious expression injection and command execution. Organizations running vulnerable versions of n8n should upgrade promptly to mitigate risk. Given n8n’s role in automating workflows, exploitation could disrupt business processes, leak sensitive data, or allow lateral movement within networks.

For European organizations, the impact of CVE-2026-25049 can be substantial. n8n is used to automate complex workflows that often integrate multiple systems and services, including sensitive business applications and data sources. Exploitation could lead to unauthorized command execution on servers hosting n8n, resulting in data breaches, service disruption, or full system compromise. This could affect confidentiality by exposing sensitive data processed in workflows, integrity by altering or sabotaging automated processes, and availability by causing service outages. The ability for an authenticated user to escalate privileges and execute arbitrary commands increases the risk of lateral movement and persistence within enterprise networks. Critical sectors such as finance, manufacturing, healthcare, and government agencies that rely on automation tools for operational efficiency are particularly at risk. The disruption or compromise of automated workflows could have cascading effects on business continuity and regulatory compliance, especially under GDPR and other data protection frameworks prevalent in Europe.

European organizations should take the following specific actions to mitigate this vulnerability: 1) Immediately upgrade all n8n instances to version 1.123.17 or 2.5.2 or later, where the vulnerability is patched. 2) Restrict workflow creation and modification permissions to trusted administrators only, minimizing the number of users who can exploit this flaw. 3) Implement network segmentation and access controls to limit exposure of n8n servers to only necessary internal users and systems. 4) Monitor logs and workflow changes for unusual or unauthorized activity that could indicate exploitation attempts. 5) Employ application-level firewalls or runtime application self-protection (RASP) solutions to detect and block suspicious command execution patterns. 6) Conduct regular security audits and penetration testing focusing on workflow automation platforms to identify similar injection or execution risks. 7) Educate administrators and developers on secure workflow design and the risks of dynamic expression injection. 8) Consider deploying n8n instances within hardened containers or virtual machines with strict privilege separation to limit impact if exploited.