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Security report for posthog.com

PostHog · Technology · United States

Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

68/100

Risk levelMedium

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

PostHog is a technology company specializing in product analytics tools designed for product engineers and software developers. Founded in 2020, it offers a modern SaaS and open-source platform that includes session recording, feature flags, heatmaps, and remote configuration. The company positions itself as an innovative alternative in the product analytics market, targeting engineering teams seeking comprehensive product insights. The website reflects a professional and consistent brand image with excellent content quality and user experience. Technically, the website is built using modern frameworks such as Gatsby and React, hosted behind Cloudflare CDN services, and employs PostHog's own analytics platform for tracking. The site is fast, mobile-optimized, and SEO-friendly, demonstrating a mature digital infrastructure. Security best practices are observed with HTTPS enforcement, strong security headers, and input masking in session recordings, although DNSSEC is not enabled. From a security perspective, PostHog maintains a strong posture with no evident vulnerabilities or exposed sensitive data. Privacy and cookie policies are comprehensive and GDPR compliant, though explicit incident response contacts and vulnerability disclosure mechanisms are not clearly presented. Overall, the risk profile is low, with recommendations to enhance transparency around security incident handling and to enable DNSSEC for domain security. Strategically, PostHog is well-positioned in the technology sector with a clear business model and target audience. The website's quality and trust indicators support its credibility, making it a reliable platform for product analytics solutions.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
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

7 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 X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • 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 Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • 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

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

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

Keep watching posthog.com

This scan found 21 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
30
Email security
98
DNS health
75
Network security
100
GDPR outside view
35
Average
68

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

PostHog operates in the technology sector, focusing on product analytics for software development teams. Its open-source and SaaS hybrid business model allows flexibility and broad adoption. The company targets product engineers and developers, offering tools that improve product success through data-driven insights. Market positioning is strong as an innovative alternative to legacy analytics platforms. The absence of parent or subsidiary companies suggests an independent operation. The company maintains active social media presence and transparent policies, indicating growth orientation and customer engagement. Partnerships or payment processors are not explicitly identified in the analyzed data.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, comprehensive security headers, and session recording features that include input masking to protect sensitive data. No critical vulnerabilities or exposed credentials were detected. Privacy policies align with GDPR requirements, and cookie consent mechanisms are implemented. However, the lack of a published vulnerability disclosure policy or security.txt file and absence of explicit incident response contact channels represent areas for improvement. DNSSEC is not enabled, which could enhance domain security. Overall, the security culture appears proactive but could benefit from increased transparency and formalized incident response processes.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Publish a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  3. Add explicit incident response contact information, such as a dedicated security email address.
  4. Regularly review and update privacy and cookie policies to maintain compliance with evolving regulations.
  5. Enhance transparency around data retention policies and user data handling practices.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
PostHog
Description
We’re building every tool for product engineers to build successful products.
Key services
product analytics, session recording, feature flags, heatmaps, remote config
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, React, Gatsby, Cloudflare, PostHog analytics
Frameworks
Gatsby
Platforms
Cloudflare
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Content Security Policy
  • Cookie flags set
  • Session recording with input masking

Analytics and tracking

Services
PostHog
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
PostHog
Marketing tools
PostHog analytics
Transparency
basic

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. Strong focus on product analytics tools for engineers
  3. Good security posture with HTTPS and security headers
  4. Comprehensive privacy and cookie policies present
  5. No explicit incident response or vulnerability disclosure found
  6. Modern tech stack with Gatsby and React
  7. Clear branding and professional design
  8. No suspicious or malicious content detected
Technical notes

Notes

The website leverages a modern technology stack including React and Gatsby for frontend rendering, supported by Cloudflare for DNS and CDN services. The use of PostHog's own analytics platform indicates a closed feedback loop for product improvement. Performance is optimized with preloading fonts and asynchronous script loading. The site is mobile responsive and accessible, with proper meta tags for SEO. No deprecated or vulnerable libraries were detected in the analyzed scripts. Hosting and registrar details align with industry standards, ensuring reliability and scalability. Opportunities exist to further modernize by enabling DNSSEC and expanding security automation.
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. 73/100 +2Medium28 findingsView report
  2. 71/100 −2Medium30 findingsView report
  3. 73/100Medium26 findingsView report
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