Security audit

Property Rental Yield Calculator

Security checks for vulnerabilities and agentic risk

Overview

This is a disclosed UK property listing and rental-yield helper with no executable code, persistence, credential access, or hidden data movement.

Reasonable to install for UK property listing drafts and rental-yield estimates. Treat the financial and tax outputs as estimates, verify current SDLT and tax rules with official sources or a qualified adviser, and provide only the property details needed for the calculation or listing.

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

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

Findings (1)

Natural-Language Policy Violations

Low

Category: Not specified by scanner
Confidence: 94% confidence
Finding: The instruction 'UK English throughout' is a natural-language locale requirement that applies to every output. Because the skill does not present this as an opt-in or explain that it is only for users who want UK English, it conflicts with the policy against forcing a specific language or locale without user choice.
Content: No source excerpt is available for this finding.