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Security audit

stock_data

Security checks for vulnerabilities and agentic risk

Overview

This skill fetches public stock-analysis data from SimplyWall.st in a way that matches its stated purpose and shows no hidden persistence, credential access, or destructive behavior.

Before installing, understand that the skill sends requested ticker and exchange lookups to SimplyWall.st and returns parsed public stock data. It does not need API keys or local credentials, but users should treat its results as third-party financial data rather than investment advice.

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
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (3)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
95% confidence
Finding

The skill explicitly documents direct HTTP fetching from an external site, but the manifest declares no corresponding tool scope or permission boundary. That mismatch is a real security issue because it hides network capability from reviewers and policy enforcement, increasing the chance of unintended data exfiltration, SSRF-like misuse through future code changes, or unauthorized outbound requests under the guise of a benign finance skill.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The description says to use the skill when the user asks about stock prices, valuation, financials, dividend, or investment analysis for any global stock. This trigger guidance is broad and does not define boundaries or exclusions, so it may cause the skill to activate for general finance discussion that does not actually require fetching external stock data.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
84% confidence
Finding

The trigger list hard-codes Indonesian terms such as 'saham', 'cek saham', and 'analisa' alongside English terms, but the file does not explain any language-selection behavior or indicate that this locale choice is optional. This can violate language/locale policy expectations when a skill implicitly assumes a specific language without user opt-in.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.