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Security report for posthog.com

PostHog · Technology · N/a

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

73/100

Risk levelMedium

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

PostHog is a technology company founded in 2020 that offers an all-in-one platform tailored for developers to build successful products. Their platform integrates product analytics, feature flags, session replays, experiments, and surveys, positioning them as a niche leader in developer-focused product analytics and experimentation. The website reflects a modern SaaS business model targeting developer and product teams, with a strong emphasis on developer usability and comprehensive product insights. Technically, the website is built using modern frameworks such as Gatsby and React, hosted via Cloudflare with Amazon Registrar as the domain registrar. The site demonstrates excellent performance, mobile optimization, and SEO practices. The use of PostHog's own analytics platform for tracking and session recording indicates a mature digital infrastructure and self-reliance on proprietary tools. From a security perspective, the website enforces HTTPS, implements key security headers, and uses secure cookie persistence with input masking for session recordings. However, there is room for improvement by enabling DNSSEC, publishing a dedicated security policy, and providing explicit incident response contacts. No critical vulnerabilities or exposed sensitive data were detected. Overall, PostHog's website presents a professional, trustworthy, and secure digital presence aligned with its business goals. The domain registration is consistent with the company's founding date, and privacy policies are comprehensive and GDPR compliant. The absence of phone contact is noted but compensated by clear email and form-based communication channels.

Scanned

This is an earlier scan of posthog.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
70/ 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

5 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 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

  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 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

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

Keep watching posthog.com

This scan found 20 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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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
62
Security headers
30
Email security
93
DNS health
85
Network security
100
GDPR outside view
70
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

PostHog operates in the technology sector, focusing on developer-centric product analytics and feature management. Their competitive advantage lies in offering an integrated platform that combines analytics, feature flags, session replays, and experimentation, which appeals to developer teams seeking comprehensive product insights. The business model is SaaS-based, generating revenue through subscriptions. Target customers include software developers, product managers, and tech companies. The company shows growth potential through its specialized offerings and developer community engagement. Partnerships and integrations with cloud and CDN providers enhance their ecosystem. Strategic observations include the importance of expanding incident response transparency and enhancing security disclosures to build further trust.

Security posture

The website exhibits a strong security posture with HTTPS enforcement, robust security headers, and secure session recording practices including input masking. The use of clientDeleteProhibited and clientTransferProhibited domain statuses further secures the domain from unauthorized changes. However, the lack of a published security policy, incident response contacts, and vulnerability disclosure mechanisms represents gaps in transparency and readiness. No vulnerable libraries or exposed sensitive data were identified. Compliance with GDPR is indicated through privacy policies and cookie consent mechanisms. The security culture appears proactive but could benefit from formalizing incident response and disclosure processes.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Publish a dedicated security policy page detailing security practices and controls.
  3. Add explicit incident response contact channels such as security@ or abuse@ emails.
  4. Implement and publish a security.txt file to facilitate vulnerability disclosures.
  5. Regularly audit third-party scripts and dependencies to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
PostHog
Description
PostHog is the only all-in-one platform for product analytics, feature flags, session replays, experiments, and surveys that's built for developers.
Key services
product analytics, feature flags, session replays, experiments, surveys
Content quality
excellent
Branding
consistent

Technology

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

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Content Security Policy implemented
  • Secure cookie persistence
  • Session recording with input masking

Analytics and tracking

Services
PostHog
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
PostHog analytics
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. Content is developer-focused and professionally presented.
  3. Strong use of modern web technologies and frameworks.
  4. Good security posture with HTTPS and security headers.
  5. Privacy and cookie policies are present and comprehensive.
  6. No explicit contact phone numbers found; contact primarily via email and forms.
  7. No explicit security policy or incident response contact published.
  8. No vulnerability disclosure or security.txt found.
  9. WHOIS data is transparent and domain age matches company history.
Technical notes

Notes

The website is built on a modern technology stack including React and Gatsby, ensuring fast loading times and excellent mobile responsiveness. Hosting via Cloudflare provides CDN and security benefits. The site uses PostHog's own analytics platform for data collection and session replay, demonstrating technical maturity and self-sufficiency. SEO and accessibility are well addressed with proper meta tags and responsive design. No significant technical debt or performance bottlenecks were detected. Opportunities exist to enhance DNS security and formalize security-related disclosures to reduce technical risks.
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. 68/100 −3Medium29 findingsView report
  2. 71/100 −2Medium30 findingsView report
  3. 73/100Medium26 findingsView report
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