Security audit
MTD Quarterly Update (UK): year-to-date figures & deadline
Security checks for vulnerabilities and agentic risk
Overview
This skill calculates quarterly tax-update totals from figures you provide, with access proportionate to that purpose.
Share only the category totals needed and check results against current [HMRC guidance](https://www.gov.uk/guidance/use-making-tax-digital-for-income-tax/send-quarterly-updates). The linked external tool could not be inspected; review its privacy terms before uploading financial records.
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
- 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
- Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Static analysis
No suspicious patterns detected.