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Security audit

Isocast

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed guide for using the Isocast weather-signal API, with no bundled executable code or hidden local behavior.

Before installing, be aware that the skill is meant to contact an external API and may guide an agent through paid x402 signal purchases. Only allow paid routes, Telegram delivery setup, or prediction-market use when you explicitly want those actions and they are legal in your jurisdiction.

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
  • 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 (2)

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 27)May include surrounding context.

md
odds for every bucket (with `dead: true` on buckets the day can no longer reach). Browsing is
free and needs no auth; deeper signals are per-city bundles bought pay-per-call.

Full API docs: [api.isocast.dev/llms.txt](https://api.isocast.dev/llms.txt) | OpenAPI spec: [api.isocast.dev/openapi.json](https://api.isocast.dev/openapi.json)

## What a signal is

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 81)May include surrounding context.

md
odds for every bucket (with `dead: true` on buckets the day can no longer reach). Browsing is
free and needs no auth; deeper signals are per-city bundles bought pay-per-call.

Full API docs: [api.isocast.dev/llms.txt](https://api.isocast.dev/llms.txt) | OpenAPI spec: [api.isocast.dev/openapi.json](https://api.isocast.dev/openapi.json)

## What a signal is

Static analysis

No suspicious patterns detected.