CVE-2026-25631 in n8n
Summary
by MITRE • 02/06/2026
n8n is an open source workflow automation platform. Prior to 1.121.0, there is a vulnerability in the HTTP Request node's credential domain validation allowed an authenticated attacker to send requests with credentials to unintended domains, potentially leading to credential exfiltration. This only might affect user who have credentials that use wildcard domain patterns (e.g., *.example.com) in the "Allowed domains" setting. This issue is fixed in version 1.121.0 and later.
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Analysis
by VulDB Data Team • 02/19/2026
The vulnerability identified as CVE-2026-25631 affects n8n, an open source workflow automation platform that enables users to create automated workflows through visual node-based interfaces. This security flaw resides within the HTTP Request node functionality, which is a core component used to make HTTP requests as part of automated workflows. The vulnerability represents a critical authorization bypass that could potentially allow attackers to escalate privileges and access sensitive data through improper credential handling mechanisms. The issue specifically impacts the domain validation logic that governs how credentials are processed and transmitted within the platform's HTTP request capabilities.
The technical flaw manifests in the credential domain validation mechanism of the HTTP Request node, where the platform fails to properly restrict credential usage to only the intended domains. When users configure credentials with wildcard domain patterns such as *.example.com in the "Allowed domains" setting, the validation process becomes susceptible to bypass attacks. An authenticated attacker with access to the n8n platform can exploit this weakness to send HTTP requests that carry user credentials to unintended target domains, effectively enabling credential exfiltration. This type of vulnerability falls under CWE-285: Improper Authorization, specifically relating to insufficient domain validation controls that allow unauthorized access to resources.
The operational impact of this vulnerability is significant for organizations using n8n with wildcard domain configurations in their credential settings. Attackers could potentially harvest authentication tokens, API keys, or other sensitive credentials from workflows that interact with multiple domains through wildcard patterns. The vulnerability is particularly concerning because it only requires authentication access to the platform, making it exploitable by insiders or attackers who have gained access to legitimate user accounts. This could lead to unauthorized access to downstream systems, data breaches, and potential lateral movement within network environments where n8n is integrated. The attack vector aligns with ATT&CK technique T1566.001: Phishing: Spearphishing Attachment, as attackers could leverage compromised credentials to access additional systems, though the specific technique is more accurately categorized under credential compromise through improper access controls.
Organizations should immediately upgrade to n8n version 1.121.0 or later to remediate this vulnerability, as this update includes proper domain validation controls that prevent credential leakage to unintended domains. System administrators should conduct immediate audits of existing credential configurations, particularly focusing on wildcard domain patterns in the "Allowed domains" settings, and consider removing or restricting such patterns where possible. Additional mitigations include implementing network segmentation to limit access to the n8n platform, monitoring for unusual HTTP request patterns, and establishing robust access controls through multi-factor authentication. The fix addresses the core validation logic by ensuring that credentials are only transmitted to domains explicitly permitted in the configuration, thereby preventing the credential exfiltration that was previously possible through wildcard domain patterns. Security teams should also consider implementing network-based intrusion detection systems to monitor for suspicious HTTP traffic patterns that might indicate exploitation attempts.