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Security report for kmail-lists.com

Klaviyo · Technology · United States

Low risk. 3 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

77/100

Risk levelLow

0–100, higher is better. How it is calculated

Klaviyo is a leading marketing automation platform specializing in email and SMS marketing for eCommerce businesses. Founded in 2012 and headquartered in Boston, MA, it offers a SaaS solution that enables personalized customer engagement through data-driven campaigns. The company holds a strong market position with a focus on technology-driven marketing solutions tailored for online retailers. Technically, Klaviyo's website demonstrates a mature digital infrastructure, leveraging modern JavaScript frameworks, CDN hosting via AWS Cloudfront, and integration with analytics and experimentation tools such as Google Tag Manager and Optimizely. The site is well-optimized for performance, mobile responsiveness, and accessibility, reflecting a high level of digital maturity. From a security perspective, the website enforces HTTPS, employs security headers, and uses reCAPTCHA to protect forms. However, it lacks a publicly visible dedicated security policy or incident response contact, which could be improved to enhance transparency and trust. No vulnerabilities or suspicious content were detected, and privacy compliance is supported by comprehensive privacy and cookie policies. Overall, Klaviyo presents a professional and trustworthy online presence with strong technical and security foundations. Strategic enhancements in security transparency and WHOIS data availability would further strengthen its risk profile and stakeholder confidence.

Scanned

NIS2 and GDPR posture

GDPR outside view
73/ 100 · Medium
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

3 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

  3. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
75
Security headers
65
Email security
65
DNS health
85
Network security
100
GDPR outside view
73
Average
77

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Klaviyo operates in the technology and eCommerce sectors, providing marketing automation tools that empower online retailers to engage customers effectively. Its SaaS business model relies on subscription revenues, targeting medium to large eCommerce businesses globally. The company benefits from a strong brand, consistent messaging, and a comprehensive service offering including email and SMS marketing, customer data management, and analytics. Market positioning is robust, with Klaviyo recognized as a leader in personalized marketing automation. The company maintains active social media channels and provides clear contact avenues, supporting customer engagement and sales. While no parent or subsidiary companies were identified, Klaviyo's ecosystem includes integrations with various eCommerce platforms and marketing tools, enhancing its competitive advantage. Growth indicators include a well-maintained website with rich content, professional design, and active marketing efforts. The absence of suspicious domains or partners suggests a focused and legitimate business operation.

Security posture

Klaviyo's security posture is solid, with HTTPS enforced site-wide and multiple security headers implemented to mitigate common web vulnerabilities. The use of Google reCAPTCHA on forms adds protection against automated abuse. No exposed sensitive data or vulnerable libraries were detected in the website content. However, the lack of a dedicated security policy page and incident response contact information limits transparency and may hinder rapid communication in case of security incidents. There is also no public vulnerability disclosure program or security.txt file, which are best practices for mature security programs. Compliance with GDPR is indicated by the presence of comprehensive privacy and cookie policies with consent mechanisms. Overall, the security maturity is good but could be enhanced by publishing explicit security governance documents and incident response contacts.

Recommendations

  1. Publish a dedicated security policy page outlining security practices and commitments.
  2. Provide clear incident response contact information such as security@ or abuse@ email addresses.
  3. Implement and publicize a vulnerability disclosure program or security.txt file.
  4. Regularly audit and update third-party scripts and libraries to mitigate potential vulnerabilities.
  5. Enhance WHOIS transparency or provide justification for privacy protection to improve trust.

Contact details published on the site

Addresses
Legal name
Klaviyo, Inc.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Klaviyo
Description
Klaviyo is a marketing automation platform designed for eCommerce businesses to deliver personalized email and SMS marketing campaigns.
Key services
Email marketing automation, SMS marketing, Customer data platform, Segmentation and personalization
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React (likely), Google Tag Manager, Cloudfront CDN, reCAPTCHA
Frameworks
Optimizely (for experimentation and analytics)
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of reCAPTCHA for forms
  • Content Security Policy present
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Optimizely Real User Monitoring, Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Optimizely RUM
Marketing tools
Klaviyo marketing automation itself, Google reCAPTCHA
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenge
  2. Professional marketing automation platform targeting eCommerce businesses
  3. Comprehensive privacy and cookie policies present
  4. No explicit security policy or incident response info publicly available
  5. Modern technology stack with good performance and security practices
  6. No suspicious or malicious content detected
  7. WHOIS data unavailable, possibly due to privacy protection
Technical notes

Notes

The website is built on a modern JavaScript stack, likely using React or similar frameworks, with extensive use of asynchronous scripts and third-party integrations. Hosting is via AWS Cloudfront CDN, ensuring fast global delivery. Performance metrics indicate fast loading times and good mobile optimization. SEO and accessibility best practices are followed, with proper meta tags, structured data, and responsive design. The site uses Google Tag Manager and Optimizely for analytics and experimentation, supporting data-driven marketing strategies. Technical risks are minimal, but reliance on multiple third-party scripts requires ongoing monitoring to prevent supply chain vulnerabilities. The absence of a CMS mention suggests a custom or headless architecture, which can offer flexibility but requires strong development governance.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

Earlier scans of this domain

  1. 72/100Medium22 findingsView report
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