Covert Channel Subscription Vulnerability in xzvexpzcbailey Package
Summary
MAL-2026-17412: Malicious code in xzvexpzcbailey (npm). Affects xzvexpzcbailey versions 1.0.0 – 2.5.0. No fix is published. How to fix ↓
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Background
The xzvexpzcbailey package is a part of a large family of forks derived from the Baileys WhatsApp Web library. It is designed to interact with the WhatsApp socket layer, enabling users to send and receive messages. However, this package has been identified to contain malicious code that exploits the user's authenticated WhatsApp session.
Vulnerability Detail
The vulnerability arises from the package's ability to inject a covert channel-subscription action into the WhatsApp socket layer. Upon connection, the malicious code executes an authenticated 'w:mex' FOLLOW query against attacker-controlled WhatsApp Channel/Newsletter JIDs, using the user's own session. This results in the victim's account being silently subscribed to channels without their consent. The obfuscation techniques used to hide the target JIDs include string literals, base64 encoding, and runtime reconstruction, making it difficult for users to detect the malicious behavior.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall xzvexpzcbaileyIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a workaround, consider removing the xzvexpzcbailey package from your project entirely until a secure version is confirmed. You can do this by executing: npm uninstall xzvexpzcbailey.
Conclusion
The xzvexpzcbailey package contains a serious vulnerability that allows attackers to exploit users' authenticated WhatsApp sessions for unauthorized channel subscriptions. It is crucial to update or remove the package to mitigate risks associated with this vulnerability.
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FAQ
xzvexpzcbailey is a fork of the Baileys WhatsApp Web library that allows interaction with WhatsApp's messaging services.
The vulnerability allows attackers to subscribe your account to channels without your consent, potentially leading to unwanted messages and privacy concerns.
You may notice unexpected subscriptions to channels or newsletters that you did not join, as well as unusual activity in your WhatsApp account.
Yes, Vulert can monitor your package-lock.json file for open-source vulnerabilities in real-time, alerting you to any issues, including this one.
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