wechat-bro@1.0.1
AI agent interface for WeChat Web — send/receive messages, manage contacts, upload media, transcribe voice
AI Security Review
scanned 3mo ago · by lpm-firewall-aiNo malicious payload or covert external exfiltration was found. However, the unauthenticated command interface provides a concrete file-exfiltration vulnerability, so it should warn rather than publish-block.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Run the wechat-bro daemon after logging in to WeChat.
Impact
Potential local-file and message-data exfiltration by another reachable client.
Mechanism
Unauthenticated WebSocket dispatch to privileged file-send commands
AI rationale
No malicious payload or covert external exfiltration was found. However, the unauthenticated command interface provides a concrete file-exfiltration vulnerability, so it should warn rather than publish-block.
Evidence
package.jsonsrc/cli.jssrc/ws-server.jssrc/upload.js~/.wechat-bro/cookies.json~/.wechat-bro/messages.jsonl~/.wechat-bro/download/
Network endpoints2
wx.qq.comws://localhost:9231
Decision evidence
public snapshotAI called this Suspicious at 92.0% confidence as Critical Vulnerability with medium false-positive risk.
Evidence for warning
- WebSocket server binds with only a port and dispatches commands without authentication.
- Any connected client can request send-file with an arbitrary readable path.
- Session cookies are saved locally and used for WeChat media uploads.
- postinstall automatically invokes npx to download Chromium.
Evidence against
- Source behavior implements the declared WeChat automation interface.
- No hidden exfiltration endpoint, credential harvesting, or remote payload execution was found.
- Network use is limited to WeChat functionality and the local WebSocket interface.
Behavioral surface
ChildProcessEnvironmentVarsFilesystemNetworkWebSocket
HighEntropyStringsUrlStrings
Source & flagged code
5 flaggedpackage.jsonView file
•scripts.postinstall = node -e "const p=require('path'),o=require('os'),d=p.join(o.homedir(),'.wechat-bro','chromium');process.env.PUPPETEER_CACHE_DIR=d;const pup=require('puppeteer');(async()=>{try{awai...
Critical
Red Install Lifecycle Script
Install-time lifecycle script matches a deterministic static-gate block pattern.
package.jsonView on unpkg•scripts.postinstall = node -e "const p=require('path'),o=require('os'),d=p.join(o.homedir(),'.wechat-bro','chromium');process.env.PUPPETEER_CACHE_DIR=d;const pup=require('puppeteer');(async()=>{try{awai...
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkgsrc/upload.jsView file
9L10: const { execFileSync } = require('child_process')
L11: const fs = require('fs')
High
Child Process
Package source references child process execution.
Findings
1 Critical4 High3 Medium4 Low
CriticalRed Install Lifecycle Scriptpackage.json
HighInstall Time Lifecycle Scriptspackage.json
HighChild Processsrc/upload.js
HighSame File Env Network Executionsrc/cli.js
HighRuntime Package Installsrc/cli.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowScripts Present
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to wechat-bro@1.0.1.
See all versions of wechat-bro for other recorded verdicts.
- Review the evidence and your use of wechat-bro@1.0.1 before allowing it. Restrict the permissions described in this report.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
Evidence last updated: .
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