An urgent security alert for our Web3 readership. Details have been disclosed regarding a maximum-severity security flaw (CVE-2026-21858), codenamed “Ni8mare” by Cyera Research Labs, in n8n—a popular workflow automation platform. This vulnerability carries a critical CVSS score of 10.0, allowing an unauthenticated remote attacker to gain complete control over susceptible instances.
The implications for the Web3 space are significant. n8n is frequently utilized within the ecosystem for automating tasks such as data aggregation, triggering specific DeFi operations, managing infrastructure bots, and handling critical notifications. If an attacker leverages this flaw to compromise an n8n instance connected to Web3 backend infrastructure, the cascading effects could include unauthorized access to key management systems, manipulation of critical oracle data feeds, or interference with automated smart contract operations.
All Web3 projects and developers utilizing n8n must immediately verify their deployment versions and apply the patches provided by the vendor. Given the potential for this type of supply chain attack, continuous monitoring of the security posture of all external dependencies and workflow tools is paramount to maintaining the integrity of decentralized systems.
Source: Critical n8n Vulnerability (CVSS 10.0) Allows Unauthenticated Attackers to Take Full Control
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