MAL-2026-18857

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@kurtucoben/cstm-bail/MAL-2026-18857.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-18857

Published

2026-10-27T00:00:00Z

Modified

2026-11-09T23:15:23Z

Summary

Malicious code in @kurtucoben/cstm-bail (npm)

Details

@kurtucoben/cstm-bail is a fork of the Baileys WhatsApp Web library that silently subscribes the installer's own WhatsApp account to WhatsApp Channels chosen by the publisher. When the socket connects, code in lib/Socket/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363401967885236@newsletter (stored as base64 strings), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

Database specific

{
    "iocs": {
        "domains": [],
        "files": [
            {
                "digests": {
                    "sha256": "17932079301cab87114fdd7fd33b3a0a0a46d591fe929b26334b5b815d44964e"
                },
                "paths": [
                    "lib/Socket/newsletter.js"
                ]
            }
        ],
        "ips": [],
        "urls": []
    }
}

References

Credits

- CyberXYZ - FINDER
- - https://cyberxyz.io

Affected packages

npm / @kurtucoben/cstm-bail

Package

Name: @kurtucoben/cstm-bail; View open source insights on deps.dev
Purl: pkg:npm/%40kurtucoben/cstm-bail

Affected ranges

Affected versions

1.*

1.0.0

Database specific

cwes

[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@kurtucoben/cstm-bail/MAL-2026-18857.json"