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MSC-2026-6393
Published:July 29, 2026
Updated:August 02, 2026
Dependency-confusion attack, escalated variant of 99.0.0, same webhook https://test.v3n.my/pwn. preinstall+install+postinstall all run 'node index.js'. Adds require('fs'), safeExec(cmd,{shell:true,timeout:10000}), an UNCONDITIONAL top-level post({type:'exfil'}) at module load before the try block, and a second post({type:'recon', whoami, files:fs.readdirSync(cwd)}). Exfiltrates system data plus env vars matching /KEY|SECRET|TOKEN|PASS|AUTH|CRED|PRIVATE|AWS_|AZURE_|GCP_|GITHUB|NPM|DB_|DATABASE|API/i. Blocked at package level (both of the package's only 2 versions malicious, 0 downloads). Verified statically from the Defender diff (version1=99.0.0); package already 404 on npm.
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CVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH
Exploit Maturity
HIGH
Weakness Type (CWE)
Inclusion of Functionality from Untrusted Control Sphere
Exposure of Sensitive Information to an Unauthorized Actor
Embedded Malicious Code
Insufficiently Protected Credentials