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Security audit

Tmp.2Z44zTwlap

Security checks for vulnerabilities and agentic risk

Overview

This skill is for a real SignUpGenius integration, but it asks users to run an unpinned third-party MCP package and route reusable account credentials through local configuration or a browser extension.

Install only if you are comfortable trusting the referenced npm package and browser extension with your SignUpGenius account session. Prefer a pinned and reviewed package version, avoid project-level config files for secrets, restrict file permissions, rotate credentials if exposed, and require manual confirmation before using the group-member or RSVP write tools.

A.I.G

Vulnerability Patterns
  • Insecure DependenciesIntroduces malicious components through unsafe dependency sources
  • Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
  • 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
Findings (3)

T08 · Insecure Dependencies

Error
Location
SKILL.md:19
Finding

Unpinned Third-Party Package Is Downloaded and Executed Automatically

Content
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Remediation
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T08 · Insecure Dependencies

Error
Location
SKILL.md:17
Finding

Recommended Authentication Mode Exposes Reusable Session Cookies to External Components

Content
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Remediation
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T09 · Insecure Skill Coding Practices

Warning
Location
SKILL.md:34
Finding

Long-Lived Passwords and API Keys Are Placed Directly in MCP Configuration

Content
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Remediation
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SkillSpector

Vulnerability Patterns
  • Rogue AgentSelf-Modification, Session Persistence
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (4)

MCP Config Access

High
Category
Agent Snooping
Confidence
95% confidence
Finding

Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.

Content

Scanner excerpt · SKILL.md (reported line 19)May include surrounding context.

Mode 1 — fetchproxy fallback (zero env vars, recommended)

Install the fetchproxy extension once, sign into signupgenius.com, and add to .mcp.json (project) or ~/.claude/mcp.json (global):

json
{

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The trigger description is extremely broad, including generic phrases like "available slots" and "any request involving" a wide range of sign-up scenarios. This can cause unintended invocation in unrelated contexts, exposing SignUpGenius account data or initiating write-capable workflows when the user did not explicitly intend to use this integration.

Content

No source excerpt is available for this finding.

Session Persistence

Medium
Category
Rogue Agent
Confidence
60% confidence
Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · SKILL.md (reported line 8)May include surrounding context.

md
# signupgenius-mcp

MCP server for [SignUpGenius](https://www.signupgenius.com) — 14 read tools + 2 write across profile, groups, sign-ups, and reports.

- **npm:** [npmjs.com/package/signupgenius-mcp](https://www.npmjs.com/package/signupgenius-mcp)
- **Source:** [github.com/chrischall/signupgenius-mcp](https://github.com/chrischall/signupgenius-mcp)

Missing User Warnings

Low
Category
Not specified by scanner
Confidence
88% confidence
Finding

The skill exposes write actions (signupgenius_add_group_member and signupgenius_rsvp) but the description and examples do not state that the agent must warn or confirm with the user before performing mutations. In an agent setting, this increases the risk of accidental account changes from ambiguous or casually phrased requests.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.