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Security audit

Ucp Ap2 Mandates

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed guide for implementing autonomous payment mandates, with no bundled code, persistence, or hidden execution behavior.

Install only if you are intentionally building AP2-style autonomous payment flows. Treat any implementation as financial software: require explicit user opt-in, narrow spending and validity limits, audit logs, revocation handling, and human review for high-risk transactions.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The skill explicitly targets fully autonomous payments without human-in-the-loop, but its description does not warn users that it enables delegated spending authority and reduced per-transaction oversight. This omission can lead developers or operators to deploy the skill without appropriate consent, limits, monitoring, or risk controls, increasing the chance of unauthorized or over-broad payment execution.

Content

No source excerpt is available for this finding.