CVE-2026-35589 nanobot: Cross-Site WebSocket Hijacking in WhatsApp Bridge (CVE-2026-2577 Fix Update)
Attackers can hijack WhatsApp sessions and send messages via WebSocket due to missing Origin validation in the nanobot AI assistant bridge.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-35589?
CVE-2026-35589 is a high-severity vulnerability in HKUDS nanobot, published on 14 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
nanobot is a personal AI assistant. Versions prior to 0.1.5 contain a Cross-Site WebSocket Hijacking (CSWSH) vulnerability exists in the bridge's WebSocket server in bridge/src/server.ts, resulting from an incomplete remediation of CVE-2026-2577. The original fix changed the binding from 0.0.0.0 to 127.0.0.1 and added an optional BRIDGE_TOKEN parameter, but token authentication is disabled by default and the server does not validate the Origin header during the WebSocket handshake. Because browsers do not enforce the Same-Origin Policy on WebSockets unless the server explicitly denies cross-origin connections, any website visited by a user running the bridge can establish a WebSocket connection to ws://127.0.0.1:3001/ and gain full access to the bridge API. This allows an attacker to hijack the WhatsApp session, read incoming messages, steal authentication QR codes, and send messages on behalf of the user. This issue has bee fixed in version 0.1.5.
Weakness: CWE-1385
Which versions are affected by CVE-2026-35589?
It affects 1 product.
Products include Nanobot Nanobot.
How do I fix CVE-2026-35589?
No fix has been published for CVE-2026-35589 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-35589 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35589 exists.
Other vulnerabilities in HKUDS nanobot
Sources
Also known as GHSA-v5j3-4q66-58cf.