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Security audit

Sendook Email (Restricted)

Security checks for vulnerabilities and agentic risk

Overview

This skill clearly documents that it reads and sends email through a configured Sendook inbox using the user's API key.

Install only for a Sendook inbox you are authorized to let an agent process. Use a least-privileged API key, keep SENDOOK_API_KEY private, and review agent actions carefully before allowing replies, new outbound emails, or attachments containing local files.

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 (9)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
78% confidence
Finding

This markdown file describes capabilities to read inbox messages and send replies, which inherently involve access to potentially sensitive personal or business communications. While the file documents scope limitations and attachment safety, it does not provide a clear user-facing warning about privacy implications or careful handling of message contents.

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 62)May include surrounding context.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

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 62)May include surrounding context.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

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 66)May include surrounding context.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

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.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

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 103)May include surrounding context.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

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 117)May include surrounding context.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

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 136)May include surrounding context.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

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 184)May include surrounding context.

bash
# List all messages
curl https://api.sendook.com/v1/inboxes/$SENDOOK_INBOX_ID/messages \
  -H "Authorization: Bearer $SENDOOK_API_KEY"

# Search messages

Static analysis

No suspicious patterns detected.