MicrosoftExchangeServerMCP
Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
Electron: Use-after-free in offscreen child window paint callback
Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks
Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path
Electron: Renderer command-line switch injection via undocumented commandLineSwitches webPreference
Electron: Context isolation bypass via Function.prototype.bind hijack
AUTH_METHODbasic, oauth or certificateENABLE_ADMIN_TOOLSENABLE_MAILBOX_TOOLSEXCHANGE_ENDPOINTBase URL including scheme and hostEXCHANGE_INSECUREYou can also set =true or EXCHANGE_POWERSHELL_URL=https://<fqdn>/PowerShell as environment variables. On startup the server logs whether insecure mode is enabled and which endpoints are in use.EXCHANGE_PASSWORDauth.basic.password — —EXCHANGE_POWERSHELL_URIEXCHANGE_POWERSHELL_URLYou can also set EXCHANGE_INSECURE=true or =https://<fqdn>/PowerShell as environment variables. On startup the server logs whether insecure mode is enabled and which endpoints are in use.EXCHANGE_PROVIDEREXCHANGE_PS_URLEXCHANGE_SERVERFull PowerShell remoting URL. Setting EXCHANGE_SERVER automatically configures both endpoint and PowerShell URIEXCHANGE_SERVERSComma-separated list of PowerShell URIs for high availability, for example https://exch01/PowerShell,https://exch02/PowerShellEXCHANGE_SERVER_LISTEXCHANGE_UPDATER_BRANCHEXCHANGE_UPDATER_REPOEXCHANGE_VERSIONMCP_ALLOWLISTComma-separated CIDR ranges for IP allowlistMCP_API_KEYSImportant: HTTP transport now requires authentication (see [Security Notes](#security-notes)). Configure or other auth methods before starting.MCP_BASIC_PASSUsername and password for Basic authenticationMCP_BASIC_USERUsername and password for Basic authenticationMCP_BEARER_TOKENSComma-separated bearer tokens for Bearer token authenticationMCP_DENYLISTComma-separated CIDR ranges for IP denylistMCP_HTTP_AUTH_ENABLEDEnable authentication for HTTP transport (secure by default)MCP_HTTP_AUTH_METHODapikey, bearer, basic, none or array like [apikey, bearer]MCP_PROTECT_HEALTHRequire authentication for /health endpointMCP_RATE_LIMIT_MAX_REQUESTSMaximum requests per window per IPMCP_RATE_LIMIT_WINDOW_MSRate limit window in millisecondsMCP_TRANSPORTstdio or httpOAUTH_CLIENT_IDauth.oauth.clientId — —OAUTH_CLIENT_SECRETPOWERSHELL_URLVITE_DEV_SERVER_URLPORTTool 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
679/679 tools missing one or more hints — exchange_get_activesyncvirtualdirectory (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); exchange_get_authredirect (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); exchange_get_autodiscovervirtualdirectory (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +676 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
531/679 tools referenced in tests (78%)
Write tests that reference each tool by name so every tool has at least one test.
Shell command execution
6 calls in production code run through a shell (src/desktop/updater.ts:80, src/desktop/updater.ts:81, src/desktop/updater.ts:82)
Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.
Dev dependencies
7 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
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