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Security report for posthog.com

PostHog, Inc. · Technology · United States

Medium risk. 4 critical or high findings in Security headers and GDPR outside view.

Security score

73/100

Risk levelMedium

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

PostHog, Inc. is a technology company providing an all-in-one platform for product analytics, feature flags, session replays, experiments, and surveys, primarily targeting developers and product teams. Positioned as a competitive alternative to traditional data stacks, PostHog offers a usage-based pricing model with a generous free tier, emphasizing open source and transparency. Their platform supports multiple SDKs across web and mobile, enabling comprehensive user behavior analysis and feature management. Technically, the website is built on modern frameworks like Gatsby and React, hosted on Vercel, and employs a robust tech stack including Node.js, Python, and Java. The site demonstrates excellent performance, mobile optimization, and SEO practices. Security-wise, PostHog maintains a strong posture with SOC 2 certification, HSTS enforcement, and a comprehensive content security policy, though enforcement of CSP and incident response transparency could be improved. Overall, PostHog presents a professional, trustworthy, and developer-focused platform with a clear commitment to privacy and security.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
43/ 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

4 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

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

Keep watching posthog.com

This scan found 19 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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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
82
Security headers
30
Email security
95
DNS health
85
Network security
100
GDPR outside view
43
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 with a focus on product analytics and developer tools. Their business model is SaaS-based with usage-based pricing, appealing to startups and growth-stage companies. The company benefits from Y Combinator backing and maintains a strong open source presence, fostering community engagement and transparency. Their competitive advantage lies in offering multiple integrated products on a single platform, reducing engineering overhead for customers. PostHog's ecosystem includes partnerships with cloud providers and integrations with popular developer tools. The company emphasizes privacy, data control, and compliance, catering to customers with stringent data protection requirements. Growth indicators include a large free tier, active community, and continuous product expansion. Strategic observations highlight their focus on developer experience, transparent operations, and competitive pricing.

Security posture

PostHog exhibits a mature security posture with key strengths including SOC 2 certification, strict transport security with a long max-age, and a comprehensive content security policy in report-only mode. The SSL configuration is good, with no weak or vulnerable protocols or cipher suites detected. The site employs best practices such as frame-ancestors set to 'none' to prevent clickjacking and uses secure headers to mitigate common web vulnerabilities. However, the absence of enforced CSP (only report-only) and lack of published incident response contacts or security.txt file indicate areas for improvement. There is no explicit mention of a Data Protection Officer or detailed incident response procedures publicly available. Overall, the security culture appears strong but could benefit from enhanced transparency and enforcement of security policies.

Recommendations

  1. Enforce the Content Security Policy rather than using report-only mode to prevent potential XSS attacks.
  2. Enable modern TLS protocols (TLS 1.2 or higher) to ensure secure communications.
  3. Implement and display a clear cookie consent mechanism to comply with privacy regulations.
  4. Publish a security.txt file and incident response contact information to improve vulnerability disclosure and incident handling transparency.
  5. Consider appointing and publishing Data Protection Officer contact details to enhance GDPR compliance and trust.
Technical notes

Notes

The website is built using modern web technologies including Gatsby (React-based static site generator), React, and Next.js for SDKs. The tech stack includes multiple programming languages and frameworks such as Node.js, Python, Java, PHP, Ruby, C#/.NET, and Flutter for mobile. Hosting is provided by Vercel, ensuring fast global delivery with CDN support. The site demonstrates excellent performance and mobile optimization, with comprehensive SEO metadata and Open Graph tags. The use of PostHog's own analytics platform indicates a high level of digital maturity and self-monitoring. Technical risks are minimal, though the lack of enforced CSP and outdated TLS protocol support could pose future challenges. Overall, the infrastructure is modern, scalable, and well-integrated with developer tools and cloud services.
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 −5Medium29 findingsView report
  2. 73/100 +2Medium28 findingsView report
  3. 71/100Medium30 findingsView report
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