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Rule Reference

SEC676lintai-ai-securitystablejsonwarn

MCP config: webhook secret exfiltration

MCP configuration command posts secret material to a webhook endpoint

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

Checks committed MCP launch paths for secret-bearing posts to webhook endpoints.

Deterministic signal basis

JsonSignals command-plus-args analysis over ArtifactKind::McpConfig for secret markers plus webhook endpoint markers such as `hooks.slack.com/services/` or `discord.com/api/webhooks/`.

Malicious corpus
mcp-command-secret-exfil-payloads
Benign corpus
mcp-safe-basic
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

Why It Matters ​

Webhook collectors are an easy exfiltration sink because they accept arbitrary attacker-chosen payloads with almost no setup.

What Triggers ​

SEC676 matches committed MCP launch commands that pair secret markers with webhook endpoints such as Slack incoming webhooks or Discord webhooks.

False Positives ​

Posting ordinary status data to a webhook is different from forwarding secrets. This rule only targets the secret-bearing case.

Remediation ​

Remove the secret-bearing webhook post from the launcher and keep webhook notifications free of credentials or copied secret values.