MSC-2026-6456
Published:August 13, 2026
Updated:August 13, 2026
Malicious forks of the Baileys WhatsApp Web library published to npm. The forks abuse the installer's authenticated WhatsApp session to silently follow attacker-controlled WhatsApp channels, inject the author's advertising URL into outgoing media, forge channel attribution on the victim's outgoing messages, and in one case send a message from the installer's account and then block the bot. 70 package names across 343 versions are confirmed malicious; the upstream baileys library is not compromised.
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Contact UsCVSS v4
Base Score:
8.5
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
LOW
Subsequent System Integrity
HIGH
Subsequent System Availability
LOW
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Embedded Malicious Code