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Security report for growthbook.io

GrowthBook, Inc. · Technology · N/a

Medium risk. 3 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

75/100

Risk levelMedium

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

GrowthBook, Inc. operates an open source feature flagging and A/B testing platform designed to empower companies to experiment fearlessly and deliver confidently. Positioned as a leading open-source solution, GrowthBook offers seamless integration of feature flags and experimentation tools, supporting enterprise-grade statistics and data science capabilities. The platform targets technology companies and teams seeking to improve product deployment and experimentation workflows with a focus on data privacy and control. GrowthBook's market presence is reinforced by notable customers and community engagement, including a Slack community and GitHub open source contributions. Technically, the website is built on modern web technologies including Webflow CMS, JavaScript SDKs, and integrates multiple analytics and marketing tools such as Google Analytics, HubSpot, and LinkedIn Insight. The site is well-optimized for performance, mobile responsiveness, and accessibility, reflecting a mature digital infrastructure. The platform supports multiple programming languages and offers both cloud and self-hosted deployment options, indicating flexibility and scalability. From a security perspective, GrowthBook demonstrates strong compliance with SOC II and GDPR standards, employs HTTPS with good SSL configuration, and implements privacy and cookie policies with consent mechanisms. However, explicit security headers and a public vulnerability disclosure policy are not clearly visible, suggesting areas for improvement. The absence of WHOIS data due to privacy protection is typical for technology firms and does not detract from the overall trustworthiness given the company's certifications and transparent open source approach. Overall, GrowthBook presents a professional, secure, and privacy-conscious platform with a strong community and enterprise focus. Strategic recommendations include enhancing visible security policies, publishing incident response contacts, and maintaining transparency around vulnerability disclosures to further strengthen trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
80/ 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. 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

  2. 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 Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

  3. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • High

      Unregistered MX Record

      MX record points to unregistered domain: hejjtgeaxm7klwyevnmqzoy5ptpclxlrk5ya4ym7b4hxlujdjoxq.mx-verification.google.com

      What to do: Remove or fix MX record pointing to unregistered domain

      • RFC 5321 §5.1
      • NIS2 21(2)(i)
      • IR 2024/2690 12.4: Implementing Regulation (EU) 2024/2690, Annex point 12.4: Asset inventory
      • NIST CM-8: NIST SP 800-53 Rev. 5 CM-8: System Component Inventory

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

Keep watching growthbook.io

This scan found 22 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

€25per month

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

Email alerts on material changes and an exportable JSON history of every change.

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Full report

€39.90one-time

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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
72
Security headers
60
Email security
70
DNS health
65
Network security
100
GDPR outside view
80
Average
75

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

GrowthBook is positioned as a technology company specializing in open source feature flagging and experimentation platforms. Its business model combines open source software with cloud-based and self-hosted offerings, employing seat-based pricing suitable for teams of various sizes. The company targets technology teams including engineering, data science, product management, and marketing professionals. GrowthBook's competitive advantages include its open source nature, enterprise-grade statistical engines, and integration with modern data stacks. The presence of high-profile customers and a growing community indicates healthy market traction. The company leverages partnerships with major analytics and event tracking providers to enhance its platform capabilities. GrowthBook's operations emphasize data privacy, security certifications, and community engagement, supporting sustainable growth and customer trust.

Security posture

GrowthBook exhibits a mature security posture with SOC II certification and GDPR compliance prominently displayed. The website enforces HTTPS and uses secure SDKs, contributing to a strong baseline security level. Privacy and cookie policies with consent mechanisms are implemented, reflecting good privacy practices. However, the lack of explicit security headers in the HTML and absence of a publicly accessible vulnerability disclosure or incident response contact information represent gaps in transparency and security communication. No vulnerabilities or exposed sensitive data were detected in the website content. The use of multiple third-party analytics and marketing scripts introduces a moderate tracking footprint, which is managed with privacy compliance in mind. Overall, the security maturity is good but could be enhanced by publishing detailed security policies and response procedures.

Recommendations

  1. Publish and prominently link a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  2. Explicitly implement and document security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  3. Provide clear incident response contact information, including dedicated security or abuse email addresses.
  4. Regularly audit third-party scripts to minimize privacy risks and ensure compliance with evolving regulations.
  5. Maintain transparency around security certifications and update trust indicators as new compliance achievements occur.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
GrowthBook, Inc.
Description
GrowthBook is an open source platform that gives any company the power of a customized feature flagging and A/B testing system.
Key services
Feature Flagging, A/B Testing, Warehouse Native Data Integration, Experiment Insights, MCP Server for AI
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Python, Ruby, PHP, Google Fonts (Lato), Webflow CMS, Google Tag Manager, HubSpot, LinkedIn Insight Tag, Koala SDK, jQuery 3.5.1, GrowthBook SDK
Frameworks
Webflow
Platforms
GrowthBook Cloud, Self-hosted GrowthBook
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • SOC II and GDPR compliance
  • No exposed sensitive data in HTML
  • Use of secure SDKs
  • Privacy policy and cookie consent implemented

Analytics and tracking

Services
Google Analytics, HubSpot Analytics, LinkedIn Insight
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google Ads, LinkedIn Ads
Tracking pixels
LinkedIn Insight Tag, HubSpot Analytics
Marketing tools
HubSpot, LinkedIn Insight
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 rich content and professional design
  2. Strong emphasis on open source and community engagement
  3. Clear trust signals including SOC II and GDPR compliance
  4. No direct contact emails or phone numbers found on main pages
  5. Multiple external analytics and marketing scripts used
  6. No visible security.txt or vulnerability disclosure policy
  7. WHOIS data unavailable, likely due to privacy protection
Technical notes

Notes

The website is built using Webflow CMS with a modern JavaScript-based frontend. It employs lightweight SDKs for multiple programming languages, including JavaScript, Python, Ruby, and PHP, supporting fast load times and real-time feature flag evaluation. Integration with major analytics and marketing platforms such as Google Analytics, HubSpot, LinkedIn Insight, and Koala SDK indicates a sophisticated tracking and marketing infrastructure. The site is mobile-optimized, accessible, and SEO-friendly with proper meta tags and Open Graph data. Performance is fast, supported by CDN usage for static assets. The technical stack reflects a well-maintained and scalable platform suitable for enterprise use. Opportunities exist to enhance security header implementation and to document security practices more explicitly.
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. 73/100Medium30 findingsView report
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