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Security audit

managing-contacts

Security checks for vulnerabilities and agentic risk

Overview

This is a Mailtrap contacts helper whose API examples are purpose-aligned, but users should supervise bulk, delete, and export actions involving contact data.

Before installing or using this skill, be aware that Mailtrap contacts may include personal data. Use a least-privilege Mailtrap token, confirm the target account and list, and require explicit approval before bulk imports, deletes, or exports.

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 (4)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
92% confidence
Finding

The skill explicitly enables create, update, delete, bulk import, and export operations on real marketing contact data, but it does not warn users that these actions can modify or disclose production PII. In a contacts-management context this is materially risky because an agent could perform destructive changes or export sensitive recipient data without adequate user confirmation or privacy guardrails.

Content

No source excerpt is available for this finding.

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 36)May include surrounding context.

md
## Endpoints (replace placeholders)

| Action                                 | Method  | URL                                                                                       | Reference                                                                                      |
| -------------------------------------- | ------- | ----------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------- |
| Create / get / update / delete contact | various | `https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/contacts`                          | [Contacts](https://docs.mailtrap.io/developers/promotional/contacts/contacts.md)               |
| Bulk import (async job)                | `POST`  | `https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/contacts/imports`                  | [Bulk import](https://docs.mailtrap.io/developers/promotional/contacts/bulk-import.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 36)May include surrounding context.

md
## Endpoints (replace placeholders)

| Action                                 | Method  | URL                                                                                       | Reference                                                                                      |
| -------------------------------------- | ------- | ----------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------- |
| Create / get / update / delete contact | various | `https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/contacts`                          | [Contacts](https://docs.mailtrap.io/developers/promotional/contacts/contacts.md)               |
| Bulk import (async job)                | `POST`  | `https://mailtrap.io/api/accounts/$MAILTRAP_ACCOUNT_ID/contacts/imports`                  | [Bulk import](https://docs.mailtrap.io/developers/promotional/contacts/bulk-import.md)         |

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 53)May include surrounding context.

Single contact create (with custom fields)

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

Static analysis

No suspicious patterns detected.