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Security audit

Text to Published Podcast RSS

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward guide for publishing text as podcast audio through the cast0 API, with the main risk being that created episodes are public RSS content.

Install only if you intend to send episode text to cast0 and publish the resulting audio through a public podcast feed. Do not submit secrets, private personal information, or confidential business material unless public distribution is acceptable, and keep the API key protected in your local environment.

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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (8)

Credential Access

High
Category
Privilege Escalation
Confidence
60% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 28)May include surrounding context.

Each API key is tied to one podcast. Once you have the key, save it:

bash
echo "CAST0_API_KEY=pk_xxxxx" >> .env

Create an Episode

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 16)May include surrounding context.

md
**Base URL:** `https://api.cast0.ai`
**Auth:** `Authorization: Bearer pk_xxxxx`
**Docs:** `https://api.cast0.ai/docs`

## Setup

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 34)May include surrounding context.

md
**Base URL:** `https://api.cast0.ai`
**Auth:** `Authorization: Bearer pk_xxxxx`
**Docs:** `https://api.cast0.ai/docs`

## Setup

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 47)May include surrounding context.

md
**Base URL:** `https://api.cast0.ai`
**Auth:** `Authorization: Bearer pk_xxxxx`
**Docs:** `https://api.cast0.ai/docs`

## Setup

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 56)May include surrounding context.

md
**Base URL:** `https://api.cast0.ai`
**Auth:** `Authorization: Bearer pk_xxxxx`
**Docs:** `https://api.cast0.ai/docs`

## Setup

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 65)May include surrounding context.

md
**Base URL:** `https://api.cast0.ai`
**Auth:** `Authorization: Bearer pk_xxxxx`
**Docs:** `https://api.cast0.ai/docs`

## Setup

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 34)May include surrounding context.

Create an Episode

bash
curl -X POST https://api.cast0.ai/api/episodes \
  -H "Authorization: Bearer pk_xxxxx" \
  -H "Content-Type: application/json" \
  -d '{"title": "Daily Standup", "text": "Here is what happened today..."}'

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The skill explicitly states that every podcast has a public RSS feed URL with no authentication, but it does not warn the user that all generated audio becomes publicly subscribable and broadly distributable. In this context, users may unintentionally publish sensitive, proprietary, or personal text as a public podcast episode, creating a real confidentiality and privacy risk.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.