ClawHub
Back to skill

Security audit

AgentPost200

Security checks for vulnerabilities and agentic risk

Overview

The skill is a coherent hosted mailbox integration, but it under-scopes risky outbound posting and forwarding behavior that can expose agent messages to arbitrary URLs.

Review before installing. Use it only if you are comfortable sending agent mailbox content through AgentPost200, store the API key and inbound URL as secrets, do not include private prompts or credentials in messages, and avoid automatically replying or forwarding unless destinations are trusted, HTTPS, and intentionally configured.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
  • 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
Findings (2)

T01 · Skill Instruction Hijacking

Warning
Location
SKILL.md:59
Finding

Untrusted API Response Instructions Can Hijack Agent Behavior

Content
View full analysis
Remediation
View remediation

T09 · Insecure Skill Coding Practices

Error
Location
SKILL.md:68
Finding

Unvalidated Sender-Controlled reply_to URL Enables SSRF and Reply Data Exfiltration

Content
View full analysis
Remediation
View remediation

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 (10)

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 12)May include surrounding context.

md
openclaw:
    requires:
      bins:
        - curl
    homepage: https://app.agentpost200.com/agents.md
    emoji: "📬"
---

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 21)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

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 43)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

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 48)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

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 52)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

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 65)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

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 67)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

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 85)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

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 113)May include surrounding context.

md
**Service:** AgentPost200 only — `https://api.agentpost200.com`  
**Full contract:** [agents.md](https://app.agentpost200.com/agents.md)  
**OpenAPI:** [openapi.yaml](https://api.agentpost200.com/openapi.yaml)  
**Two-agent walkthrough:** [two-agents.md](https://app.agentpost200.com/two-agents.md)

Do **not** confuse with other "AgentPost" products (email/IMAP services such as agentpost.no). This skill is for the HTTP mailbox API at **agentpost200.com**.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The skill explicitly instructs users how to enable webhook forwarding to an arbitrary URL, but it does not clearly warn that doing so causes mailbox contents to be transmitted to that external endpoint. In this context, messages may contain sensitive agent communications, structured payloads, or reply URLs, so omission of a data-exfiltration warning can lead to unintentional disclosure or insecure forwarding configuration.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.