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Security audit

text to speech / tts unlimitedtts.com x402

Security checks for vulnerabilities and agentic risk

Overview

This skill is a narrowly scoped text-to-speech payment workflow that discloses its external API use and wallet-signing requirements.

Before using it, confirm the quote amount, voice, text, and wallet network/payee before authorizing payment. Do not share seed phrases or private keys; use only a wallet/tool that signs the specific quoted payment requirement.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (3)

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 · references/direct-x402.md (reported line 5)May include surrounding context.

md
Use this mode only with an x402 v2 wallet-aware HTTP client or a separate wallet tool. Never collect wallet secrets in chat, tool arguments, source code, or logs.

1. Read `https://api.unlimitedtts.com/docs` and `https://api.unlimitedtts.com/tts/voices`.
2. Select a full voice id such as `openai_nova`; never send bare `nova`.
3. Enforce the user's limit before signing. Character billing currently follows JavaScript/UTF-16 `text.length`.
4. Prefer `POST https://api.unlimitedtts.com/x402/tts` with one stable JSON body:

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 · references/direct-x402.md (reported line 8)May include surrounding context.

md
Use this mode only with an x402 v2 wallet-aware HTTP client or a separate wallet tool. Never collect wallet secrets in chat, tool arguments, source code, or logs.

1. Read `https://api.unlimitedtts.com/docs` and `https://api.unlimitedtts.com/tts/voices`.
2. Select a full voice id such as `openai_nova`; never send bare `nova`.
3. Enforce the user's limit before signing. Character billing currently follows JavaScript/UTF-16 `text.length`.
4. Prefer `POST https://api.unlimitedtts.com/x402/tts` with one stable JSON body:

Scope Creep

Low
Category
Excessive Agency
Confidence
70% confidence
Finding

Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.

Content

Scanner excerpt · LICENSE (reported line 12)May include surrounding context.

text
permit persons to whom the Software is furnished to do so.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE

Static analysis

No suspicious patterns detected.