Gmail Multi-Account MCP Server (ishaan-skyacres/gmail-multi-mcp) 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.
Enables Claude Desktop to interact with multiple Gmail accounts via MCP, providing tools for sending, searching, reading, labeling, filtering, thread management, drafts, and attachments. It also ensures correct thread replies and recoverable deletes.
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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ishaan-skyacres
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: CRLF injection in Nodemailer List-* header comments allows arbitrary message header injection
Nodemailer has SMTP command injection due to unsanitized `envelope.size` parameter
Nodemailer: Improper TLS Certificate Validation in OAuth2 Token Fetch Enables Credential Interception
Nodemailer Vulnerable to SMTP Command Injection via CRLF in Transport name Option (EHLO/HELO)
GMAIL_MCP_DATA_DIRSet to override where the CLI and MCP server look for credentials.json and accounts/:Tool 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
40/40 tools missing one or more hints — send_email (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); create_draft (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); send_draft (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +37 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 inputs are validated
30/40 tool handlers declare input schemas (75%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool test coverage
Only 0/40 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 1 high severity in production deps — nodemailer@8.0.1 (high), nodemailer@8.0.1 (low)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dependency freshness
1/9 production deps stale: @google-cloud/local-auth@2024-01-08 (2.6y)
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