Security audit
fastmail
Security checks for vulnerabilities and agentic risk
Overview
This is a disclosed Fastmail integration that can read, organize, send, and automate email through Maton, with clear approval requirements for sensitive actions.
Install this only if you are comfortable authorizing Maton to access your Fastmail account. Treat sends, deletes, mailbox changes, masked-address changes, functions, triggers, and destinations as high-impact actions that should be reviewed before approval; prefer the CLI credential flow and avoid handling raw API keys unless necessary.
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.