CVE-2026-27577 is a critical vulnerability affecting n8n, an open-source workflow automation platform. This vulnerability allows an authenticated user with permission to create or modify workflows to exploit crafted expressions in workflow parameters, potentially triggering unintended system command execution on the host running n8n. The CVSS score for this vulnerability is 9.4, indicating its critical severity and the significant risk it poses to organizations that utilize this platform.
Organizations should prioritize patching immediately. The affected versions include all n8n versions prior to 2.10.1, 2.9.3, and 1.123.22. Users are strongly encouraged to upgrade to one of these versions or later to remediate all known vulnerabilities. In cases where immediate upgrading is not feasible, temporary mitigations such as limiting workflow creation and editing permissions to trusted users, and deploying n8n in a hardened environment with restricted operating system privileges and network access should be considered.
The urgency of addressing this vulnerability cannot be overstated, as it directly impacts the integrity and confidentiality of systems utilizing n8n. Failure to act promptly could result in severe consequences, including unauthorized access and exploitation of critical system functions.
Given the critical nature of this vulnerability, it is essential for organizations using n8n to take immediate action to mitigate the risks associated with CVE-2026-27577.
Vulnerability Details
The CVE-2026-27577 vulnerability is characterized as a command injection vulnerability due to improper handling of user input in the expression evaluation process. The official description indicates that prior to the patched versions of n8n (2.10.1, 2.9.3, and 1.123.22), there were additional exploits identified following CVE-2025-68613.
The vulnerability has a CVSS score of 9.4, which classifies it as critical. It is essential to note that this score reflects the high impact on confidentiality, integrity, and availability, with a low attack complexity and no user interaction required.
The affected product is n8n, and the vulnerability was made public on February 25, 2026. The Common Weakness Enumeration (CWE) classification for this vulnerability is CWE-94.
Technical Analysis
The root cause of CVE-2026-27577 lies in the flawed expression evaluation logic within n8n, which can be manipulated by authenticated users. The attack vector is over the network, and the attack complexity is low, making it easier for potential attackers to exploit this vulnerability. Privileges required are low, as an authenticated user is sufficient to execute the exploit.
There is no requirement for user interaction, which further amplifies the risk. The impact on confidentiality, integrity, and availability is rated as high, indicating that successful exploitation can lead to significant operational disruptions and unauthorized data access.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to systems and the execution of arbitrary commands. The blast radius is substantial, as an attacker can gain control over the host system running n8n, leading to further exploitation of the network. The urgency to remediate this vulnerability is critical, given the high CVSS score and the lack of a known exploit in the wild, as reported in CVE_INTELLIGENCE_JSON.
Organizations should assess their deployment of n8n and take immediate steps to mitigate risks associated with CVE-2026-27577. This includes prioritizing the upgrade to patched versions and considering temporary mitigations to limit exposure until a full upgrade can be performed.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of n8n prior to 2.10.1, 2.9.3, and 1.123.22 are affected. Users should upgrade to these versions or later to ensure protection against this vulnerability.
Mitigation & Remediation
To mitigate the risks associated with CVE-2026-27577, administrators should implement the following measures:
1. Upgrade to n8n versions 2.10.1, 2.9.3, or 1.123.22 or later.
2. If an upgrade is not feasible, limit workflow creation and editing permissions to trusted users only.
3. Deploy n8n in a hardened environment with restricted operating system privileges and network access.
Organizations should also consider performing regular security assessments and penetration testing to identify and remediate similar vulnerabilities in the future. For further details on securing n8n, refer to the official documentation.
Detection Guidance
Monitoring for signs of exploitation is crucial. Organizations should look for the following indicators:
1. Unusual commands executed on the n8n host.
2. Unauthorized changes to workflow configurations.
3. Logs indicating unexpected user actions or access patterns.
AppSecure Threat Intelligence Insight
CVE-2026-27577 highlights the importance of secure coding practices, especially in platforms that allow user-generated content. Understanding the patterns of vulnerabilities in expression evaluation can help developers build more resilient applications.
Security teams should learn from this incident to refine their security posture and consider implementing robust input validation and sanitization measures.
Organizations may also benefit from engaging in regular penetration testing to identify weaknesses in their systems. For insights on effective penetration testing strategies, consider reading about penetration testing services and how they can be applied to bolster security frameworks.
In conclusion, CVE-2026-27577 is a stark reminder of the vulnerabilities present in workflow automation tools and the critical need for continuous monitoring and proactive security measures.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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