Gmail MCP Server
Enables sending, reading, and managing Gmail emails through MCP clients like Claude, supporting both App Password and OAuth2 authentication, with features like listing unread emails, archiving, and using Mustache templates.
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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yasiraquil
Source: Glama
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Install from
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.
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
Nodemailer: Message-level raw option bypasses disableFileAccess/disableUrlAccess, enabling arbitrary file read and full-response SSRF in the delivered message
Nodemailer’s addressparser is vulnerable to DoS caused by recursive calls
Nodemailer: Email to an unintended domain can occur due to Interpretation Conflict
Nodemailer: CRLF injection in Nodemailer List-* header comments allows arbitrary message header injection
GMAIL_APP_PASSWORDGMAIL_CLIENT_IDGMAIL_CLIENT_SECRETGMAIL_REDIRECT_URIGMAIL_REFRESH_TOKENGMAIL_USERTool 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
10/10 tools missing one or more hints — send_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); send_introduction_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); check_gmail_config (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +7 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.
Secrets not logged
1 secret value sent to error
Redact or omit secret values from log output.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@0.5.0 (high), nodemailer@6.10.1 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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