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Security audit

using-email-templates

Security checks for vulnerabilities and agentic risk

Overview

This is a documentation-only Mailtrap template helper; its email-sending examples contact Mailtrap as expected and no hidden or persistent behavior was found.

Use this skill when you intentionally work with Mailtrap templates. Treat live sends and bulk sends as externally visible actions, keep MAILTRAP_API_TOKEN scoped and stored in environment variables, and use Mailtrap sandbox/testing flows before sending real messages.

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
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • 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 (3)

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 50)May include surrounding context.

Example (curl) — template send

bash
curl -X POST https://send.api.mailtrap.io/api/send \
  -H "Authorization: Bearer $MAILTRAP_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{

Whitespace Padding

Medium
Category
Prompt Injection
Confidence
70% confidence
Finding

Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.

Content

Scanner excerpt · SKILL.md (reported line 99)May include surrounding context.

md
## Common mistakes

| Mistake                                   | Fix                                                                                                                                                                   |
| ----------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Mixing `text`/`html` with `template_uuid` | Use template fields per API schema for template sends                                                                                                                 |
| Skipping sandbox for risky changes        | Preview with sandbox sending / Testing API (see `testing-with-sandbox` and [send test emails](https://docs.mailtrap.io/developers/email-sandbox/send-test-emails.md)) |

Whitespace Padding

Medium
Category
Prompt Injection
Confidence
70% confidence
Finding

Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.

Content

Scanner excerpt · SKILL.md (reported line 101)May include surrounding context.

md
| Mistake                                   | Fix                                                                                                                                                                   |
| ----------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Mixing `text`/`html` with `template_uuid` | Use template fields per API schema for template sends                                                                                                                 |
| Skipping sandbox for risky changes        | Preview with sandbox sending / Testing API (see `testing-with-sandbox` and [send test emails](https://docs.mailtrap.io/developers/email-sandbox/send-test-emails.md)) |

Static analysis

No suspicious patterns detected.