CVE-2026-71319 in devtools
Summary
by MITRE • 08/06/2026
Nuxt is an open-source web development framework for Vue.js. Prior to 3.3.1, Nuxt DevTools (development mode only) exposes a bidirectional RPC channel over the Vite HMR WebSocket via the nuxt:devtools:rpc plugin. On affected versions the channel has no authentication: any client that can reach the Vite HMR endpoint (ws://<host>:<port>/, subprotocol vite-hmr) can call RPC methods, with no token, handshake, or origin check before the channel is established. The updateOptions(), clearOptions(), and openInEditor() methods do not enforce the ensureDevAuthToken check that the other mutating methods use. openInEditor() reads the persisted behavior.openInEditor value and passes it to the launch-editor package, which spawns it as a child process. That value is settable through the equally unauthenticated updateOptions(). An attacker who can reach the HMR port can therefore chain updateOptions('behavior', { openInEditor: '<command>' }) then openInEditor('<any-existing-file>') to execute an arbitrary program on the developer's machine. This issue is fixed in 3.3.1.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability affects Nuxt development tools prior to version 3.3.1, specifically targeting the bidirectional remote procedure call channel that operates through the Vite HMR WebSocket connection. This represents a critical security flaw in development environments where authentication mechanisms are completely absent from the communication channel established between the development server and client-side tools. The issue stems from the nuxt:devtools:rpc plugin which provides unrestricted access to sensitive RPC methods without any form of authentication or authorization checks.
The technical implementation flaw involves the absence of proper authentication mechanisms within the Nuxt DevTools RPC channel that operates exclusively in development mode. Any client capable of establishing a WebSocket connection to the Vite HMR endpoint at ws://<host>:<port>/ with the vite-hmr subprotocol can invoke RPC methods without presenting credentials or tokens. This design flaw creates an attack surface where malicious actors can exploit the lack of handshake procedures, token validation, or origin verification mechanisms that should normally precede channel establishment. The vulnerability is particularly concerning because it affects methods that are not properly protected by the standard ensureDevAuthToken check mechanism used for other mutating operations.
The operational impact of this vulnerability is severe as it allows attackers with network access to the HMR port to execute arbitrary commands on developers' machines through a chained attack pattern. The exploit chain begins with the attacker calling updateOptions() to modify the behavior.openInEditor configuration parameter, followed by invoking openInEditor() which executes the specified command through the launch-editor package. This creates a privilege escalation scenario where an unauthenticated remote attacker can gain arbitrary code execution capabilities on the development environment. The vulnerability specifically targets the persistence mechanism of Nuxt DevTools and leverages the trust relationship between the development tool and the underlying operating system.
This vulnerability maps directly to CWE-284 (Improper Access Control) and CWE-78 (Improper Neutralization of Special Elements used in an OS Command) within the Common Weakness Enumeration framework, representing a clear violation of proper access control mechanisms and command injection vulnerabilities. The attack pattern aligns with MITRE ATT&CK techniques including T1059.001 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) when executed in development environments where attackers can reach the HMR endpoint through network exposure or other attack vectors. The fix implemented in version 3.3.1 addresses these issues by properly implementing authentication checks and ensuring that all RPC methods require proper authorization before execution.
The remediation strategy involves updating to Nuxt version 3.3.1 or later where the authentication mechanisms have been properly implemented for the RPC channel. Organizations should also consider network segmentation to prevent unauthorized access to development ports, implement proper firewall rules restricting access to HMR endpoints, and ensure that development environments are not exposed to untrusted networks. Additionally, developers should be educated about the security implications of running development tools in exposed environments and the importance of proper network isolation for development infrastructure. The vulnerability serves as a reminder of the critical importance of implementing proper authentication mechanisms even in development environments where the assumption of trust may lead to severe security consequences.