mcp-outlook-lite (w21180239/mcp-outlook-lite) is an MCP server listed on the M8ven Trust Index. M8ven has not graded it: we have no way to read this server ourselves. No publisher has claimed this listing.
Lightweight MCP server that enables AI agents to manage Microsoft Outlook email, calendar, and files using PKCE authentication with only a Client ID.
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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w21180239
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
Prototype Pollution in sheetJS
SheetJS Regular Expression Denial of Service (ReDoS)
AZURE_CLIENT_IDe =your-client-id \AZURE_TENANT_IDe =consumers \DISPLAYDOCKER_CONTAINERMCP_OUTLOOK_DEVICE_CODENo Set to 1 to force device code flowMCP_OUTLOOK_REDIRECT_URIMCP_OUTLOOK_WORK_DIRNo Directory for large file downloadsSSH_CLIENTSSH_CONNECTIONSSH_TTYWAYLAND_DISPLAYcontainerSSH / : device code printed to stderr — follow the linkTool 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
46/46 tools missing one or more hints — outlook_list_emails (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); outlook_send_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); outlook_get_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +43 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.
Tool test coverage
25/46 tools referenced in tests (54%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 2 high severity in production deps — xlsx@0.18.5 (high), xlsx@0.18.5 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
1 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
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