Outlook OAuth MCP Server
Enables interaction with Microsoft Outlook for managing emails and calendars through OAuth2 delegated access. It provides a stateless, spec-compliant server that allows users to authenticate and perform mail and calendar operations with their own Microsoft accounts.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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Leonine-Studios
Source: Glama
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Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
Vitest allows Remote Code Execution when accessing a malicious website while Vitest API server is listening
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
MS365_MCP_ALLOWED_TENANTSRestrict to specific tenantsMS365_MCP_CLIENT_IDyour-azure-ad-client-idMS365_MCP_CLIENT_SECRETyour-azure-ad-client-secretMS365_MCP_CORS_ORIGINCORS originsMS365_MCP_ENABLED_TOOLSall Comma-separated tool allowlistMS365_MCP_HOSTMS365_MCP_LOG_LEVELMS365_MCP_PORT3000 Server portMS365_MCP_RATE_LIMIT_REQUESTS30 Requests per windowMS365_MCP_RATE_LIMIT_WINDOW_MS60000 Window size (ms)MS365_MCP_READ_ONLY_MODEfalse Disable write operationsMS365_MCP_TENANT_IDyour-tenant-id # or 'common'MS365_MCP_USE_TONLTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
23/23 tools missing one or more hints — list-calendars (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list-calendar-events (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); search-calendar-events (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +20 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tests exist
No test files found
Add tests that exercise each declared tool.
Production dependencies are patched
0 critical, 2 high severity in production deps — @modelcontextprotocol/sdk@1.25.0 (high), @modelcontextprotocol/sdk@1.25.0 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
2 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
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