Gmail MCP Server
A Model Context Protocol server for Gmail that lets AI assistants read, send, search, label, and filter Gmail through natural language, with OAuth2 auto-authentication and full attachment support.
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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simiancraft
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.
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
Nodemailer has SMTP command injection due to unsanitized `envelope.size` parameter
GMAIL_CREDENTIALS_PATHpath to the stored user token JSONGMAIL_OAUTH_PATHpath to the client keys JSONTool 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
19/19 tools missing one or more hints — send_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); draft_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); read_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +16 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
Only 0/19 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Secrets not logged
1 secret value sent to console.log
Redact or omit secret values from log output.
Production dependencies are patched
0 critical, 2 high severity in production deps — nodemailer@7.0.3 (high), nodemailer@7.0.3 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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