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Security audit

Text to Speech

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed HeyGen text-to-speech helper that sends chosen text to HeyGen's API to generate audio.

Install this only if you are comfortable giving the agent access to your HeyGen API key and sending the text you choose for speech generation to HeyGen. Prefer the named TTS tools when available and review any use of broader HeyGen MCP tools before approving actions.

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 (12)

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
All requests require the `X-Api-Key` header. Set the `HEYGEN_API_KEY` environment variable.

```bash
curl -X GET "https://api.heygen.com/v3/voices?engine=starfish" \
  -H "X-Api-Key: $HEYGEN_API_KEY"
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
| `language` | string | | Base language code (e.g., `"en"`, `"pt"`). Auto-detected if omitted |
| `locale` | string | | BCP-47 locale for multilingual voices (e.g., `"en-US"`, `"pt-BR"`) |

### curl

```bash
curl -X POST "https://api.heygen.com/v3/voices/speech" \
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
}

async function textToSpeech(request: TTSRequest): Promise<TTSResponse["data"]> {
  const response = await fetch(
    "https://api.heygen.com/v3/voices/speech",
    {
      method: "POST",
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if locale:
        payload["locale"] = locale

    response = requests.post(
        "https://api.heygen.com/v3/voices/speech",
        headers={
            "X-Api-Key": os.environ["HEYGEN_API_KEY"],
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if locale:
        payload["locale"] = locale

    response = requests.post(
        "https://api.heygen.com/v3/voices/speech",
        headers={
            "X-Api-Key": os.environ["HEYGEN_API_KEY"],
Confidence
70% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Static analysis

No suspicious patterns detected.