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Security audit

stock-screener

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed read-only stock and ETF screener that calls the SentiSense API and does not install code, persist itself, trade, or modify user data.

Before installing, understand that the skill sends your SentiSense API key and any screen/watchlist tickers you ask it to run to SentiSense. It is suitable for read-only market research, but it should not be treated as financial advice or as a tool that can place trades.

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 (2)

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 · SKILL.md (reported line 163)May include surrounding context.

md
**Four stock fields filter and sort but are not returned on rows:** `SENTI_SCORE_TREND_7D`, `SENTI_SCORE_TREND_30D`, `SENTI_SCORE_RISING_STREAK_30D` and `PRICE_TREND_30D`. The server derives them at query time from the row's own series (`sentisenseScoreBars7D`, `sentisenseScoreBars30D`, `priceSparkline30D`), so the keys are absent, not null. A row that matched passed the threshold you set: report that ("Score trend above 0 over 7 days") and show the series, rather than printing a trend value the response does not carry.

<!-- screener-appendix:start -->
## Appendix: every field and every curated screen (snapshot)

Generated from the same catalog the API serves, refreshed with every release of this skill. The live responses from `GET /api/v1/screener/fields` and `GET /api/v1/screener/screens` are authoritative and can be ahead of this table; use this appendix to plan, and the live catalog to execute. Field names are case-sensitive and go into plans verbatim. Numeric fields take GTE/GT/LTE/LT and are sortable; nulls never match a filter and always sort last.

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 · SKILL.md (reported line 62)May include surrounding context.

Use this REST request:

bash
curl -X POST https://app.sentisense.ai/api/v1/screener/execute \
  -H "X-SentiSense-API-Key: $SENTISENSE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "plan": { "filters": [ { "fieldName": "SENTI_SCORE_7D", "op": "GTE", "value": 13 } ], "sort": { "fieldName": "SENTI_SCORE_7D", "dir": "DESC" } }, "limit": 25 }'

Static analysis

No suspicious patterns detected.