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Security audit

REST API Tester

Security checks for vulnerabilities and agentic risk

Overview

The skill is a coherent API-testing helper, but its webhook example can publicly expose captured payloads without authentication or warnings.

Review before installing or using. Use only trusted endpoints, test credentials, and synthetic webhook data. Do not expose the Flask listener publicly unless you add authentication, signature validation, redaction, and access controls, and avoid logging full payloads or hardcoding real secrets.

A.I.G

Vulnerability Patterns
  • Insecure DependenciesIntroduces malicious components through unsafe dependency sources
  • Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
  • 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
Findings (2)

T09 · Insecure Skill Coding Practices

Error
Location
SKILL.md:140
Finding

Unauthenticated Webhook Payload Disclosure Through a Publicly Exposable Endpoint

Content
View full analysis
Remediation
View remediation

T08 · Insecure Dependencies

Note
Location
SKILL.md:209
Finding

Unpinned Third-Party Dependency Installation

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • 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 (8)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The skill explicitly encourages authenticated API testing and webhook exposure, which inherently involves sending credentials, tokens, and potentially sensitive payloads over the network, yet it provides no user-facing warning or safety guidance. In a skill meant for general developer use, this omission increases the chance of accidental secret disclosure to third-party services, logs, or publicly exposed webhook endpoints.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% 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 · SKILL.md (reported line 40)May include surrounding context.

return {'error': str(e)}

Usage

test_get('https://api.github.com/users/octocat')

text

### POST with JSON Body

External Transmission

Medium
Category
Data Exfiltration
Confidence
70% 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 · SKILL.md (reported line 53)May include surrounding context.

md
default_headers.update(headers)
    
    try:
        response = requests.post(
            url, 
            json=data, 
            headers=default_headers,

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% 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 · SKILL.md (reported line 87)May include surrounding context.

md
return test_get(url, headers)

# Bearer token
test_with_auth('https://api.example.com/data', token='your_token_here')

# Basic auth
test_with_auth('https://api.example.com/data', username='admin', password='secret')

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% 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 · SKILL.md (reported line 90)May include surrounding context.

md
return test_get(url, headers)

# Bearer token
test_with_auth('https://api.example.com/data', token='your_token_here')

# Basic auth
test_with_auth('https://api.example.com/data', username='admin', password='secret')

External Transmission

Medium
Category
Data Exfiltration
Confidence
70% 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 · SKILL.md (reported line 110)May include surrounding context.

md
if method == 'GET':
                response = requests.get(url, headers=headers, timeout=30)
            elif method == 'POST':
                response = requests.post(url, json=data, headers=headers, timeout=30)
            elif method == 'PUT':
                response = requests.put(url, json=data, headers=headers, timeout=30)
            elif method == 'DELETE':

External Transmission

Medium
Category
Data Exfiltration
Confidence
70% 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 · SKILL.md (reported line 112)May include surrounding context.

md
elif method == 'POST':
                response = requests.post(url, json=data, headers=headers, timeout=30)
            elif method == 'PUT':
                response = requests.put(url, json=data, headers=headers, timeout=30)
            elif method == 'DELETE':
                response = requests.delete(url, headers=headers, timeout=30)

Missing User Warnings

Low
Category
Not specified by scanner
Confidence
88% confidence
Finding

The Basic auth example uses realistic-looking inline credentials ('admin' / 'secret') without warning that such values may be copied into real workflows, shell history, notebooks, or logs. While this is demonstrative rather than directly exploitable code, it normalizes unsafe handling of secrets and can lead to accidental credential exposure during testing.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.