Text to Speech

• Outcome: Pass
• Latest audit: Sep 11, 2026 · 4:26 AM UTC
• Version: 2.23.0

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 Hijacking: Alters the agent's session goals or safety constraints when the skill loads
• Agent Memory Poisoning: Writes attacker-controlled rules into memory that affect later sessions
• Remote Payload Retrieval and Execution: Fetches external code whose behavior can change after review
• Embedded Malicious Code: Ships malicious scripts inside the skill and executes them locally
• Unauthorized Access and Privilege Escalation: Obtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns

• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration
• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Privilege Escalation: Excessive Permissions, Sudo/Root Execution, Credential Access
• Supply Chain: Unpinned Dependencies, External Script Fetching, Obfuscated Code
• Excessive Agency: Unrestricted Tool Access, Autonomous Decision Making, Scope Creep

Findings (12)

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 23)May include surrounding context.

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"

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 63)May include surrounding context.

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"

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 93)May include surrounding context.

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"

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 131)May include surrounding context.

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"

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 177)May include surrounding context.

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"

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 193)May include surrounding context.

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"

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 233)May include surrounding context.

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"

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 284)May include surrounding context.

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"

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 190)May include surrounding context.

| 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" \

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 232)May include surrounding context.

md

}

async function textToSpeech(request: TTSRequest): Promise<TTSResponse["data"]> {
  const response = await fetch(
    "https://api.heygen.com/v3/voices/speech",
    {
      method: "POST",

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 283)May include surrounding context.

md

if locale:
        payload["locale"] = locale

    response = requests.post(
        "https://api.heygen.com/v3/voices/speech",
        headers={
            "X-Api-Key": os.environ["HEYGEN_API_KEY"],

External Transmission

Medium

• Category: Data Exfiltration
• Confidence: 70% 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 283)May include surrounding context.

md

if locale:
        payload["locale"] = locale

    response = requests.post(
        "https://api.heygen.com/v3/voices/speech",
        headers={
            "X-Api-Key": os.environ["HEYGEN_API_KEY"],

Static analysis

No suspicious patterns detected.