Nanobot Unauthenticated WhatsApp Session Hijack via WebSocket Bridge

The impact of CVE-2026-2577 is severe due to the potential for complete WhatsApp session takeover. An attacker exploiting this vulnerability can impersonate the user, sending messages as if they were the legitimate owner. More critically, they can intercept all incoming messages and media in real-time, potentially exposing sensitive information. The ability to capture authentication QR codes further amplifies the risk, as an attacker could use this to gain initial access to the WhatsApp account. This vulnerability resembles previous WebSocket-related security flaws where a lack of authentication allowed unauthorized access and control.

Organizations and individuals deploying Nanobot in environments with network access from untrusted sources are at significant risk. Shared hosting environments where multiple users share the same server instance are particularly vulnerable, as an attacker could potentially exploit the vulnerability to gain access to other users' WhatsApp accounts.

• linux / server: Monitor journalctl for WebSocket connections to port 3001 originating from unexpected IP addresses. Use ss -tulnp | grep :3001 to identify processes listening on port 3001 and their associated network connections. • generic web: Use curl -v localhost:3001 to test for unauthenticated access to the WebSocket endpoint. Examine access logs for unusual WebSocket traffic patterns. • other: Due to the 'other' platform designation, specific detection methods are limited. Focus on network monitoring and intrusion detection systems to identify suspicious WebSocket activity.

1. 2026-02-16Disclosure

   disclosure

1. 予約済み2026-02-16
2. 公開日2026-02-16
3. 更新日2026-02-17
4. EPSS 更新日2026-03-23

The primary mitigation for CVE-2026-2577 is to immediately upgrade Nanobot to version 0.1.3.Post7 or later, which includes the necessary authentication fixes. If upgrading is not immediately feasible, consider isolating the Nanobot instance on a network segment with restricted access. Implement strict firewall rules to limit inbound connections to port 3001 from untrusted networks. While not a direct fix, monitoring network traffic for unusual WebSocket connections to port 3001 can provide early warning signs of potential exploitation. There are no specific Sigma or YARA rules available at this time.