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Security audit

Brave Browser

Security checks for vulnerabilities and agentic risk

Overview

This Brave Browser skill is a disclosed local guidance skill that keeps user control around sensitive browser actions.

Before installing, be aware that this skill can guide changes to browser profiles, Shields, extensions, sync, wallet-adjacent settings, and local remote debugging. Use its consent prompts carefully, keep persistence limited to non-secret operating notes, and avoid using a daily logged-in profile for testing or automation.

A.I.G

Vulnerability Patterns
  • 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
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

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

Hidden Instructions

High
Category
Prompt Injection
Confidence
70% confidence
Finding

Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.

Content

Scanner excerpt · memory-template.md (reported line 15)May include surrounding context.

md
integration: pending | done | declined

## Context
<!-- What Brave is used for and why -->
<!-- Example: Daily browsing in one profile, automation in a separate profile -->

## Environment

Static analysis

No suspicious patterns detected.