OpenMail — agentic threat model
OpenMail acts as a high-risk communication bridge for AI agents, enabling programmatic email creation, sending, and attachment parsing. Its primary security risks stem from potential abuse for automated phishing, indirect prompt injection via parsed attachments, and the lack of visible built-in security guardrails.
OWASP AIVSS score rationale
| Autonomy of Action | 0.40 | |
| Goal-Driven Planning | 0.10 | |
| Self-Modification | 0.00 | |
| Dynamic Tool Use | 0.50 | |
| Persistent Memory | 0.20 | |
| Contextual Awareness | 0.30 | |
| Dynamic Identity | 0.60 | |
| Multi-Agent Interactions | 0.40 | |
| Non-Determinism | 0.20 | |
| Opacity & Reflexivity | 0.20 |
Scored with the canonical OWASP AIVSS formula (AIVSS calculator reference); agentic risk factors estimated from the agent’s described capabilities.
MAESTRO 7-layer threat model
Per-layer threats for this agent. Layers tagged “not certain from listing” are general, caveated commentary where the public description didn’t pin that layer.
Not certain from the listing — OpenMail parses attachments into LLM-ready text, but it is unclear if it uses an internal foundation model for this parsing or merely structures the text. If an internal model is used, it is vulnerable to indirect prompt injection via malicious email attachments.
OpenMail processes incoming emails, replies, and attachments, converting them to LLM-ready text. This introduces risks of data exfiltration, knowledge-base poisoning if downstream agents ingest this parsed data without validation, and privacy leaks of sensitive email content.
Not certain from the listing — As an API-first service, OpenMail acts as a tool for other agent frameworks rather than running its own complex orchestration framework. However, insecure integration of its API/CLI tools could lead to tool misuse or command injection.
The service hosts email infrastructure, API endpoints, webhooks, and WebSocket connections. Threats include infrastructure compromise, unauthorized inbox creation via API key theft, and abuse of the outbound email infrastructure for spam/phishing campaigns.
Not certain from the listing — There is no mention of built-in guardrails, logging, or anomaly detection for outbound spam or malicious incoming attachments, creating potential blind spots for developers integrating the API.
Not certain from the listing — The listing does not detail authentication mechanisms (beyond API/CLI access), encryption standards for emails at rest/in transit, or compliance with email security standards like SPF, DKIM, DMARC, or GDPR.
Designed specifically for AI agents, OpenMail facilitates agent-to-agent and agent-to-human communication. A compromised agent using OpenMail could propagate attacks across the ecosystem, sending malicious emails or executing cascading social engineering campaigns.
MAESTRO — the 7-layer agentic threat-modeling framework (Cloud Security Alliance / Ken Huang).
These scores are auto-generated from public information (the agent's own listing, docs, and repository) using the canonical OWASP AIVSS formula and the MAESTRO framework — an estimate for guidance, not a penetration test, audit, or certification. See the scoring methodology. Are you the vendor? Factual corrections are free.