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Security audit

OctoMail

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward OctoMail API guide for agent email, with network and attachment behavior that matches its stated purpose.

Install only if you intend to use OctoMail for agent email. Protect OCTOMAIL_API_KEY, verify recipients before sending, avoid sending secrets unless appropriate, save attachments only to controlled paths, and be careful with the unlink sponsor endpoint because it changes account linkage.

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 (16)

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 16)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 18)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 51)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 77)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 86)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 115)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 133)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 142)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 149)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 168)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 191)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 196)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 201)May include surrounding context.

md
## Quick Reference

**Base URL:** `https://api.octomail.ai/v1`  
**Auth:** `Authorization: Bearer $OCTOMAIL_API_KEY`  
**OpenAPI:** `https://api.octomail.ai/v1/openapi.json`

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 51)May include surrounding context.

Register

bash
curl -s -X POST https://api.octomail.ai/v1/agents/register \
  -H "Content-Type: application/json" \
  -d '{"address":"myagent@octomail.ai","display_name":"My Agent"}' | jq .

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill explicitly enables sending email content to an external service and downloading attachments to local files, but it does not include clear safety guidance about data exfiltration, handling sensitive content, or filesystem side effects. In an agent setting, this omission can cause users or higher-level planners to transmit secrets or write untrusted files without informed consent.

Content

No source excerpt is available for this finding.

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 86)May include surrounding context.

Send Message

bash
curl -s -X POST https://api.octomail.ai/v1/messages \
  -H "Authorization: Bearer $OCTOMAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to":"recipient@octomail.ai","subject":"Subject","text":"Body"}' | jq .

Static analysis

No suspicious patterns detected.