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    STRIDE Web API Threat Model

    1

    Turn a web API architecture into a traceable STRIDE-per-element threat model.

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    STRIDE Web API Threat Model

    STRIDE Web API Threat Model

    Example session with this skill installed

    Threat-model this fictional multi-tenant SaaS API. A browser user sends HTTPS requests to an Express API, which queries PostgreSQL. The client supplies organization_id, and the API trusts it when loading tenant records. Reconstruct the DFD, mark trust boundaries, apply STRIDE per element, verify coverage and DREAD arithmetic, then return a prioritized mitigation roadmap.

    • Read your context and instructions
    • Compiled the stride web api

    STRIDE Coverage Summary

    Elements: browser_user (external entity), express_api (process), postgres (data store), https_request_flow and sql_query_flow (data flows). Three elements cross a trust boundary.

    IDSTRIDEElementDREADTierEvidence
    WA-01Elevation of Privilegeexpress_api44CRITICALThe client supplies organization_id and the process uses it as the tenant selector without server-side membership authorization.
    WA-02Spoofingbrowser_user31HIGHThe request identity and organization selector can be presented independently.
    WA-04Denial of Serviceexpress_api34HIGHThe boundary process has no supplied resource-control evidence.
    WA-03Information Disclosurehttps_request_flow29MEDIUMTenant-scoped response data crosses the public request boundary.

    Coverage gate: each entity, process, store, and flow received only valid STRIDE categories; DREAD totals reconcile with their five inputs.

    Priority mitigation: derive organization scope from the authenticated server-side session, enforce object-level authorization before every tenant read, reject client attempts to override the organization context, and log denied cross-tenant access.

    Verification test: authenticate as a user from organization A and request an object owned by organization B while supplying both organization IDs. Pass only if every route returns the same denial and no tenant-B data appears in the response or logs.

    Scope: this model covers only the supplied architecture and controls.

    Connects securely to your tools. The creator never sees your data.

    What you get

    Threat-model a REST or GraphQL API before release.Audit authorization at tenant and object trust boundaries.Validate STRIDE coverage and DREAD arithmetic.Turn findings into a prioritized mitigation and verification plan.

    About this skill

    Build a rigorous STRIDE-per-element threat model for a web app, REST or GraphQL API, backend service, or authentication flow. The Skill reconstructs the supplied architecture as external entities, processes, data stores, data flows, and trust boundaries; applies only valid STRIDE categories per element; checks boundary-crossing authorization; validates DREAD arithmetic; and maps each evidence-bounded finding to a concrete mitigation.

    The package includes the full SKILL.md workflow, DFD method, STRIDE matrix, mitigation catalog, structured sample, coverage schema, deterministic coverage checker, tests, and a six-page PDF buyer guide.

    It does not run penetration tests, generate exploit payloads, inspect live systems, certify security, or cover AI-agent, cloud-IAM, or IoT-specific threat models.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
    1. 1

      Download the ZIP

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    2. 2

      Unzip into your skills folder

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    3. 3

      Ask your agent to use it

      Restart the agent if it was already running. It picks the skill up automatically - no config needed.

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