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Security audit

Perplexity Agent

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward Perplexity web-search helper that sends the user's query to Perplexity using a disclosed API key requirement.

Install only if you are comfortable providing a Perplexity API key and having search queries sent to Perplexity. Avoid using it for private or sensitive queries unless that fits your data-sharing expectations for the provider.

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
Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Taint TrackingDirect Taint Flow, Variable-Mediated Taint Flow, Credential Exfiltration Chain
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (4)

Tainted flow: 'headers' from os.environ.get (line 13, credential/environment) → requests.post (network output)

Critical
Category
Data Flow
Confidence
90% confidence
Finding

Credentials or environment variables flow to a network sink. This is a high-confidence indicator of credential exfiltration.

Content

Scanner excerpt · scripts/search.py (reported line 24)May include surrounding context.

python
}

    try:
        response = requests.post(url, headers=headers, json=payload)
        response.raise_for_status()
        data = response.json()

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
94% confidence
Finding

The skill instructs execution of a local Python script that uses both network access and an environment-provided API key, but it does not declare any explicit tool scope such as allowed-tools or permissions. This creates an authorization and review gap: an agent may invoke code, read sensitive environment data, and make outbound requests without the skill manifest clearly constraining or disclosing those capabilities.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · scripts/search.py (reported line 12)May include surrounding context.

python
print(json.dumps({"success": False, "error": "PERPLEXITY_API_KEY environment variable not set"}))
        return

    url = "https://api.perplexity.ai/v1/agent"
    headers = {
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json"

External Transmission

Medium
Category
Data Exfiltration
Confidence
80% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · scripts/search.py (reported line 24)May include surrounding context.

python
}

    try:
        response = requests.post(url, headers=headers, json=payload)
        response.raise_for_status()
        data = response.json()

Static analysis

No suspicious patterns detected.