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Security audit

Browser Use 3.0

Security checks for vulnerabilities and agentic risk

Overview

This browser automation skill is coherent and disclosed, but users should be careful because local mode can control signed-in Chrome sessions.

Install only if you are comfortable letting the agent drive a browser. Use an isolated cloud browser or separate profile for sensitive sites, approve logged-in account actions explicitly, avoid blind updates, and close any cloud browsers when finished.

A.I.G

Vulnerability Patterns
  • Insecure DependenciesIntroduces malicious components through unsafe dependency sources
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
Findings (1)

T08 · Insecure Dependencies

Warning
Location
SKILL.md:18
Finding

Unverified Third-Party Installation and Unattended Dependency Updates

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

Credential Access

High
Category
Privilege Escalation
Confidence
80% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 71)May include surrounding context.

md
## Browser Modes

- **Local Chrome (default)**: attaches to the user's running Chrome/Chromium via CDP — preserves logins and cookies. No browser ids or profile selection needed.
- **Cloud browser**: fresh, isolated, managed Chrome hosted by Browser Use — see Cloud Browsers below.
- **Explicit endpoint**: set `BU_CDP_URL` (HTTP DevTools endpoint) or `BU_CDP_WS` to target any CDP browser.