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Security audit

Webhook Debugger

Security checks for vulnerabilities and agentic risk

Overview

This is a small webhook-debugging skill whose request capture, local history, replay, and forwarding behavior matches its stated purpose, though users should treat captured webhook data as sensitive.

Install only if you need local webhook debugging. Use test webhook data where possible, avoid capturing production secrets, clear local history when done, and double-check any replay or forward target URL because captured request contents may be sent there.

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
Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Memory PoisoningPersistent Context Injection, Context Window Stuffing, Memory Manipulation
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (3)

Memory Manipulation

High
Category
Memory Poisoning
Confidence
80% confidence
Finding

Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.

Content

Scanner excerpt · SKILL.md (reported line 71)May include surrounding context.

md
- `webhook list` - Show request history
- `webhook show <id>` - Show request details
- `webhook replay <id> <url>` - Replay to new URL
- `webhook clear` - Clear history
- `webhook forward <url>` - Forward to another service

## Notes

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

The skill explicitly receives, inspects, and stores webhook requests locally, but it does not warn users that webhook payloads commonly contain secrets, personal data, tokens, or internal business events. Omitting this disclosure can cause users to capture and retain sensitive data unintentionally, increasing risk of local exposure, mishandling, or accidental sharing during debugging.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
98% confidence
Finding

The skill supports replaying and forwarding captured webhook requests to arbitrary URLs, but it does not warn that this transmits previously captured payloads, headers, and possibly credentials to another destination. Users may unintentionally exfiltrate sensitive data to third-party or mistyped endpoints during debugging or testing.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.