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Klaviyo Hardening Guide

Marketing Last updated: 2025-12-14

E-commerce marketing security for API keys, profile protection, and export controls

Overview

Klaviyo is an e-commerce marketing platform managing customer data, email/SMS campaigns, and behavioral analytics. REST API with private/public API keys, webhooks, and e-commerce platform integrations access customer PII and purchase history. Compromised access enables customer database exfiltration or phishing through trusted sender domains.

Intended Audience

  • Security engineers managing marketing platforms
  • Klaviyo administrators
  • GRC professionals assessing e-commerce marketing compliance
  • Third-party risk managers evaluating marketing integrations

Table of Contents

  1. Authentication & Access Controls
  2. API Security
  3. Data Security
  4. Monitoring & Detection

1. Authentication & Access Controls

1.1 Enforce SSO with MFA

Profile Level: L1 (Baseline) NIST 800-53: IA-2(1)

ClickOps Implementation

Step 1: Configure SAML SSO (Enterprise)

  1. Navigate to: Settings → Security → SSO
  2. Configure SAML IdP
  3. Enable SSO enforcement

Step 2: Enable 2FA

  1. Navigate to: Settings → Security
  2. Enable: Require 2FA for all users
  3. Configure backup methods

1.2 Role-Based Access

Profile Level: L1 (Baseline) NIST 800-53: AC-3, AC-6

ClickOps Implementation

Step 1: Define User Roles

Role Permissions
Owner Full access (1 user)
Admin Manage account settings
Manager Create campaigns
Analyst View-only
Support Limited customer access

Step 2: Configure Role Permissions

  1. Navigate to: Settings → Users
  2. Assign appropriate roles
  3. Review access quarterly

2. API Security

2.1 Secure API Keys

Profile Level: L1 (Baseline) NIST 800-53: IA-5

Description

Manage Klaviyo API keys securely.

Rationale

Attack Scenario: Private API key exposure enables full profile database export; customer PII and purchase history exfiltrated for fraud or targeted phishing.

Implementation

API Key Types:

Key Type Access Level Exposure Risk
Private API Key Full read/write High (never expose)
Public API Key Limited (client events) Low

Step 1: Rotate Private Keys

  1. Navigate to: Settings → API Keys
  2. Generate new private key
  3. Update integrations
  4. Revoke old key

Step 2: API Key Best Practices

  1. Never expose private keys in client code
  2. Use environment variables
  3. Limit access to production keys
  4. Audit key usage

2.2 Webhook Security

Profile Level: L1 (Baseline) NIST 800-53: SC-8

Implementation

Step 1: Secure Webhook Endpoints

  1. Use HTTPS only
  2. Validate webhook signatures
  3. Implement IP allowlisting

3. Data Security

3.1 Profile Data Protection

Profile Level: L1 (Baseline) NIST 800-53: SC-28

ClickOps Implementation

Step 1: Configure Data Handling

  1. Limit profile data collection
  2. Configure consent tracking
  3. Enable suppression list management

Step 2: Export Controls

  1. Restrict export permissions
  2. Audit bulk exports
  3. Configure data retention

3.2 Email Authentication

Profile Level: L1 (Baseline) NIST 800-53: SI-3

ClickOps Implementation

Step 1: Configure Domain Authentication

  1. Navigate to: Settings → Domains
  2. Configure dedicated sending domain
  3. Set up DKIM/SPF records

Step 2: Enable DMARC

  1. Configure DMARC policy
  2. Monitor authentication reports
  3. Move toward enforcement

4. Monitoring & Detection

4.1 Activity Monitoring

Profile Level: L1 (Baseline) NIST 800-53: AU-2, AU-3

ClickOps Implementation

Step 1: Review Account Activity

  1. Navigate to: Settings → Activity log
  2. Monitor user logins
  3. Track configuration changes

Detection Focus

-- Detect bulk profile exports
SELECT user_email, export_type, profile_count
FROM klaviyo_activity
WHERE action = 'export'
  AND profile_count > 10000
  AND timestamp > NOW() - INTERVAL '24 hours';

-- Detect API abuse
SELECT api_key_prefix, endpoint, COUNT(*) as calls
FROM api_log
WHERE timestamp > NOW() - INTERVAL '1 hour'
GROUP BY api_key_prefix, endpoint
HAVING COUNT(*) > 5000;

Appendix A: Edition Compatibility

Control Growth Enterprise
SAML SSO ❌ ✅
SCIM ❌ ✅
Audit Logs Limited ✅
Custom Roles ❌ ✅

Changelog

Date Version Maturity Changes Author
2025-12-14 0.1.0 draft Initial Klaviyo hardening guide Claude Code (Opus 4.5)