CVE-2026-35589Public exploitNetwork attack vector

WhatsApp session hijacking via unchecked WebSocket origins

Published Apr 14, 2026 · Updated Apr 14, 2026

Cross-site WebSocket hijacking in nanobot before 0.1.5 allows remote attackers to control WhatsApp sessions through a malicious webpage. The bridge/src/server.ts connection handler accepts browser WebSocket handshakes without checking Origin when BRIDGE_TOKEN is unset, then exposes the full bridge API. Exploitation requires the bridge to run without its optional token and a local user to visit attacker-controlled content; attackers can read messages, capture QR codes, and send messages as the linked account.

CVSS severity8.0
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site WebSocket hijacking in nanobot before 0.1.5 allows remote attackers to control WhatsApp sessions through a malicious webpage. The bridge/src/server.ts connection handler accepts browser WebSocket handshakes without checking Origin when BRIDGE_TOKEN is unset, then exposes the full bridge API. Exploitation requires the bridge to run without its optional token and a local user to visit attacker-controlled content; attackers can read messages, capture QR codes, and send messages as the linked account.

The record

CVE
CVE-2026-35589
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Data Intelligence Lab @ HKU
Product
nanobot
Classifications
CWE-1385
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Data Intelligence Lab @ HKU · nanobotversion=< 0.1.5

Published CVSS scores

8.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
9.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1385Missing Origin Validation in WebSockets

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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