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Security report for growthbook.io

GrowthBook, Inc. · Technology · N/a

Medium risk. 4 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

73/100

Risk levelMedium

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

GrowthBook, Inc. operates an open source feature flagging and experimentation platform designed to empower companies to deploy and measure product changes confidently. Positioned as a leading open-source solution, GrowthBook offers a comprehensive suite of services including feature flagging, A/B testing, warehouse-native analytics, and AI-focused MCP server capabilities. The platform targets technology companies and teams seeking scalable, customizable experimentation tools with strong privacy and security controls. Technically, the website leverages modern web technologies such as JavaScript SDKs, HubSpot, Google Tag Manager, and LinkedIn Insight tags, hosted on a performant CDN infrastructure with Webflow CMS. The site is well-optimized for mobile and accessibility, featuring fast load times and clear navigation. Security posture is robust with HTTPS enforcement, SOC II and GDPR certifications, and no visible vulnerabilities or exposed sensitive data. Privacy compliance is strong, with clear privacy and cookie policies and consent mechanisms. Overall, the website reflects a mature, professional SaaS business with a strong community and trust signals, though WHOIS data is privacy protected, which is typical for this sector.

Scanned

This is an earlier scan of growthbook.io. View the latest report

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

4 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
    • High

      SSL Certificate Expires Soon

      SSL certificate expires in 18 days

      What to do: Renew SSL certificate before expiration

      • NIS2 21(2)(h)
      • IR 2024/2690 9.2(c): Implementing Regulation (EU) 2024/2690, Annex point 9.2(c): Cryptography
      • NIST SC-17: NIST SP 800-53 Rev. 5 SC-17: Public Key Infrastructure Certificates

  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

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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
62
Security headers
60
Email security
70
DNS health
65
Network security
100
GDPR outside view
80
Average
73

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 holds a competitive position in the SaaS experimentation market by offering an open source platform that integrates feature flagging and A/B testing with data warehouse-native analytics. Its business model includes cloud and self-hosted options with seat-based pricing, appealing to medium-sized technology companies and enterprises. The company fosters a vibrant community with over 4,500 Slack members and maintains transparency through open source development on GitHub. Key partnerships and integrations with major analytics and marketing platforms enhance its ecosystem. The presence of SOC II and GDPR certifications further strengthens its market credibility. Growth indicators include active blog content, customer case studies, and continuous product releases. The company emphasizes data privacy, security, and performance, aligning with enterprise customer requirements.

Security posture

GrowthBook demonstrates a strong security maturity level, evidenced by SOC II certification and GDPR compliance. The website enforces HTTPS and uses secure third-party analytics and marketing tools. No security.txt or explicit incident response contacts were found, representing an area for improvement. The absence of exposed sensitive data and use of lightweight SDKs with local evaluation contribute to a secure user experience. However, explicit security headers like Content-Security-Policy and X-Frame-Options were not confirmed in the HTML, suggesting potential enhancement opportunities. The company’s open source nature and active community engagement indicate a proactive security culture. Overall, the security posture is robust but could benefit from improved transparency on vulnerability disclosure and incident response.

Recommendations

  1. Publish a security.txt file and provide clear incident response contact information to improve transparency and readiness.
  2. Verify and explicitly implement security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  3. Regularly audit and monitor third-party scripts and SDKs for vulnerabilities to maintain a secure environment.
  4. Enhance privacy compliance disclosures by detailing data retention policies and user data handling practices.
  5. Continue fostering community engagement and open source contributions to strengthen security culture and trust.
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 Analytics, Experiment Insights, MCP Server for AI
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Python, Ruby, PHP, Google Fonts (Lato), jQuery, WebFont Loader, Google Tag Manager, HubSpot Analytics and Messaging, LinkedIn Insight Tag, Koala SDK
Frameworks
Webflow (CMS and site builder)
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 third-party analytics and marketing scripts

Analytics and tracking

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

Advertising

Ad networks
Google Ads (AW-375969917), LinkedIn Ads
Tracking pixels
LinkedIn Insight Tag, HubSpot Analytics
Marketing tools
HubSpot, Koala SDK
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 no blocking detected
  2. Strong focus on open source and enterprise-grade experimentation tools
  3. Multiple trust signals including SOC II and GDPR compliance badges
  4. Active community engagement via Slack with thousands of members
  5. Use of modern web technologies and integrations with major analytics and marketing platforms
  6. No exposed sensitive data or obvious security vulnerabilities in HTML content
  7. WHOIS data is unavailable or privacy protected, common for SaaS companies
Technical notes

Notes

The website is built using Webflow CMS, leveraging modern JavaScript SDKs for feature flagging and experimentation. It integrates multiple analytics and marketing platforms including Google Analytics, HubSpot, LinkedIn Insight, and Koala SDK. The site is hosted on a CDN with fast load times and optimized for mobile devices. The use of lightweight SDKs and local real-time evaluation enhances performance and user experience. The technical implementation shows good SEO practices, accessibility features, and a clean, professional design. No technical debt or legacy technology indicators were found. Opportunities exist to improve explicit security header implementation and to publish vulnerability disclosure mechanisms. Overall, the technical infrastructure supports a scalable, secure, and user-friendly platform.
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. 75/100Medium30 findingsView report
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