CVE-2026-2577 in nanobot
Summary
by MITRE • 02/16/2026
The WhatsApp bridge component in Nanobot binds the WebSocket server to all network interfaces (0.0.0.0) on port 3001 by default and does not require authentication for incoming connections. An unauthenticated remote attacker with network access to the bridge can connect to the WebSocket server to hijack the WhatsApp session. This allows the attacker to send messages on behalf of the user, intercept all incoming messages and media in real-time, and capture authentication QR codes.
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Analysis
by VulDB Data Team • 02/20/2026
The vulnerability described in CVE-2026-2577 represents a critical security flaw within the WhatsApp bridge component of the Nanobot platform, which operates as a bridge between WhatsApp and other messaging systems. This bridge component creates a WebSocket server that serves as a communication channel between the Nanobot system and the WhatsApp service. The security implications of this vulnerability are severe as it fundamentally compromises the integrity and confidentiality of user communications by exposing a critical communication pathway without proper access controls.
The technical flaw manifests in the default configuration of the WebSocket server which binds to all available network interfaces using the wildcard address 0.0.0.0 on port 3001. This configuration pattern, classified under CWE-668, creates an insecure default that exposes the service to unauthorized access from any network location. The absence of authentication requirements for incoming WebSocket connections represents a fundamental failure in the principle of least privilege, where the system assumes that all network traffic should be trusted without proper verification. This vulnerability directly aligns with ATT&CK technique T1071.004 which involves application layer protocol usage for command and control communications.
The operational impact of this vulnerability extends far beyond simple unauthorized access, creating a comprehensive attack vector that allows remote attackers to completely hijack WhatsApp sessions. An unauthenticated attacker can establish WebSocket connections to the exposed bridge component and gain full control over the user's WhatsApp account, enabling them to send messages on behalf of the legitimate user. This capability represents a severe compromise of the authentication mechanisms that protect user accounts. The attacker can intercept all incoming messages and media in real-time, effectively creating a man-in-the-middle position that allows for complete surveillance of the user's communications. Additionally, the ability to capture authentication QR codes means that attackers can potentially gain access to multiple accounts or escalate their privileges within the system.
The security implications of this vulnerability are particularly concerning given that WhatsApp is designed to provide end-to-end encrypted communications, but the bridge component creates an unsecured pathway that bypasses these protections. This allows attackers to access communications that would normally be protected by encryption, effectively neutralizing the security measures that users expect from WhatsApp. The exposure of the WebSocket server on a default port also makes this vulnerability easily discoverable through network scanning activities, increasing the likelihood of exploitation. Organizations and individuals using Nanobot systems are particularly at risk as they may not be aware of this insecure default configuration, leading to prolonged exposure without proper security measures being implemented.
Mitigation strategies for this vulnerability must address both the immediate security gap and the underlying configuration issues that allowed the insecure default to persist. The primary recommendation involves changing the default WebSocket server binding to a specific network interface rather than using the wildcard address 0.0.0.0, which should be implemented through proper configuration management practices. Additionally, implementing mandatory authentication mechanisms for WebSocket connections is essential to prevent unauthorized access. Network-level security controls such as firewall rules should be configured to restrict access to port 3001 to only trusted IP addresses or networks. The system should also implement proper access controls and authentication mechanisms that align with security best practices for network services. Regular security audits and configuration reviews should be conducted to ensure that such insecure defaults do not persist in production environments. These mitigations should be implemented in accordance with security standards such as those outlined in the NIST Cybersecurity Framework and should address the specific weakness identified in CWE-668 regarding insecure default configurations.