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Rule Reference

SEC623lintai-ai-securitystablejsonwarn

MCP config: bare WebFetch auto-approve

MCP configuration auto-approves bare `WebFetch` through `autoApprove`

Provider
lintai-ai-security
Surface
json
Scope
per_file
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message_only

Activation Model

Preset Membership

This rule is part of the builtin activation graph through these preset memberships.

basemembership
mcpmembership

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Matches exact bare `WebFetch` auto-approval in MCP client config.

Deterministic signal basis

JsonSignals exact array-item detection for bare `WebFetch` in parsed `autoApprove` entries.

Malicious corpus
mcp-autoapprove-unscoped-tool-family
Benign corpus
mcp-autoapprove-unscoped-tool-family-specific-safe
structured evidence required remediation reviewed
Canonical note

Structural stable rule intended as a high-precision check with deterministic evidence.

Nearby Signals

Related Rules

SEC301MCP config: shell trampolineMCP configuration shells out through sh -c or bash -cjsonstable
SEC302Config: insecure HTTP endpointConfiguration contains an insecure http:// endpointjsonstable
SEC303MCP config: credential env passthroughMCP configuration passes through credential environment variablesjsonstable
SEC304Config: TLS verification disabledConfiguration disables TLS or certificate verificationjsonstable
SEC305Config: hardcoded auth materialConfiguration embeds static authentication material in a connection or auth valuejsonstable
SEC309Config: literal secrets in configConfiguration commits literal secret material in env, auth, or header valuesjsonstable

SEC623 / MCP-AUTOAPPROVE-WEBFETCH ​

SEC623 flags MCP configuration when autoApprove includes the exact bare tool token WebFetch.

Why It Matters ​

Bare WebFetch auto-approval grants unreviewed remote fetch authority without narrowing domains or reviewed fetch scopes.

Trigger Shape ​

This rule matches parsed McpConfig content where autoApprove contains the exact string WebFetch.

How To Fix ​

Replace bare WebFetch auto-approval with narrower reviewed scopes such as WebFetch(domain:docs.example.com) or remove shared auto-approval for unrestricted remote fetch.