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Security report for klaviyo.com

Klaviyo · Technology · United States

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

Security score

78/100

Risk levelLow

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

Klaviyo is a leading AI-first B2C CRM and marketing platform that unifies marketing and service channels such as email, SMS, and WhatsApp to deliver personalized customer experiences. The company targets B2C businesses and e-commerce companies with a SaaS subscription model, positioning itself strongly in the technology and marketing automation sectors. The website reflects a mature digital presence with modern frameworks like Gatsby and uses cloud CDN services for performance optimization. Security posture is solid with HTTPS enforced and standard security headers implied, though explicit security policies and incident response contacts are not published. Privacy compliance is well addressed with comprehensive privacy and cookie policies and consent mechanisms. Overall, the website is professional, trustworthy, and technically sound, though the lack of WHOIS data and explicit security disclosures slightly reduce domain trustworthiness from a registration perspective.

Scanned

NIS2 and GDPR posture

GDPR outside view
85/ 100 · Low
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

Need hands-on remediation? Email guard@offseq.com

Keep watching klaviyo.com

This scan found 18 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

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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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Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
65
Security headers
65
Email security
80
DNS health
75
Network security
100
GDPR outside view
85
Average
78

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 competitive AI-driven marketing automation space, focusing on B2C CRM solutions that integrate multiple communication channels. Its business model is SaaS-based, generating revenue through subscriptions. The company leverages AI agents to enhance customer engagement and personalization, which is a key competitive advantage. The website's content and branding are consistent and professional, supporting a large enterprise presence primarily in the United States. The company maintains active social media channels and provides clear privacy and cookie policies, indicating a mature compliance posture. However, the absence of publicly available WHOIS data and security incident contacts suggests areas for improvement in transparency and trust signals.

Security posture

The website demonstrates a good security posture with HTTPS enforced and likely presence of security headers such as Content-Security-Policy and X-Frame-Options. No vulnerabilities or exposed sensitive data were detected in the HTML content. The use of modern JavaScript frameworks and CDNs enhances security and performance. However, the lack of published security policies, incident response procedures, and vulnerability disclosure mechanisms limits the overall security maturity. There is no visible security.txt or dedicated security contact, which are recommended best practices. Privacy compliance is strong with GDPR indicators and cookie consent mechanisms. Overall, the security posture is good but could be enhanced by improving transparency and formalizing incident response communications.

Recommendations

  1. Publish a dedicated security policy page detailing security controls and practices.
  2. Provide clear incident response contact information including security@ or abuse@ email addresses.
  3. Implement and publish a vulnerability disclosure policy or security.txt file.
  4. Regularly audit and document third-party scripts and dependencies for vulnerabilities.
  5. Enhance WHOIS transparency or provide domain registration details to improve trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Klaviyo
Description
Klaviyo unifies marketing and service with its AI-first B2C CRM. It offers omnichannel marketing software powered by AI agents to deliver personalized experiences across email marketing, WhatsApp, and more.
Key services
Email marketing, SMS marketing, WhatsApp marketing, AI-powered customer engagement
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React (Gatsby framework), Cloudfront CDN, Optimizely
Frameworks
Gatsby 5.11.0
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of modern JavaScript frameworks
  • Cookie consent mechanism implemented

Analytics and tracking

Services
Google Analytics (implied), Optimizely
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Optimizely, Google Analytics (implied), Facebook Pixel (implied)
Marketing tools
Klaviyo AI marketing platform, Optimizely
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 challenges.
  2. WHOIS data is unavailable or protected, limiting domain trust analysis.
  3. Website uses modern technologies and frameworks with good SEO and accessibility.
  4. Privacy and cookie policies are present and comprehensive with consent mechanisms.
  5. No explicit security or incident response policies published.
  6. No vulnerability disclosure or security.txt found.
  7. Contact information is available primarily via contact forms and social media.
  8. No suspicious or malicious content detected.
  9. Website content is business-focused and safe for general audiences.
Technical notes

Notes

The website is built using modern web technologies including React with Gatsby framework, served via Amazon Cloudfront CDN for fast global delivery. It uses asynchronous loading of scripts such as Optimizely for A/B testing and analytics. The site is mobile optimized with responsive design and good accessibility features. SEO is well implemented with comprehensive meta tags including Open Graph and Twitter cards. No technical errors or broken elements were detected. The site lacks a traditional CMS, indicating a custom or static site generation approach. Performance is fast, and the technical stack supports scalability and security. Opportunities exist to improve technical documentation of security and compliance features.
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. 67/100 −12Medium23 findingsView report
  2. 79/100 +3Low25 findingsView report
  3. 76/100Low23 findingsView report
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