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Security audit

maxpreps-mcp

Security checks for vulnerabilities and agentic risk

Overview

The skill coherently retrieves public high-school sports data without accessing accounts, executing downloaded code, or changing remote data.

Expect Node.js execution, public requests to MaxPreps, and a small temporary cache; no login or API key is needed. The optional repair recipe also fetches MaxPreps asset files. All three bundled files were inspected, but live responses and the separately linked MCP project were not evaluated. Decoding may need updates when the website changes.

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
  • Tool MisuseTool Parameter Abuse, Chaining Abuse, Unsafe Defaults
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • 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)

Incomplete referenced artifact analysis

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 11)May include surrounding context.

md
`/_next/data/<buildId>/<path>.json`. `scripts/mpx.mjs` resolves the `buildId`, fetches, and decodes.

Incomplete referenced artifact analysis

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 14)May include surrounding context.

md
# scripts/mpx.mjs sits next to this SKILL.md — point M at it.

Chaining Abuse

High
Category
Tool Misuse
Confidence
75% confidence
Finding

Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.

Content

Scanner excerpt · references/recipes.md (reported line 155)May include surrounding context.

bash
curl -s https://www.maxpreps.com/nc/charlotte/myers-park-mustangs/football/25-26/roster/ \
  | grep -oE 'src="https://asset\.maxpreps\.io/[^"]+\.js"' | sed 's/src="//;s/"$//' \
  | xargs -P8 -n1 curl -s | grep -ohE 'GSSP_ROSTER_SERIALIZE_KEYS",0,\[[^]]*\]'

The contest lists live in the schedule page's chunks under deserializeContestList —

Skill declares no tool scope ('permissions' or 'allowed-tools') but code capabilities were detected: network.

Medium
Category
MCP Least Privilege
Confidence
70% confidence
Finding

Without declared permissions the skill's intent is opaque and cannot be validated.

Content

No source excerpt is available for this finding.