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Security report for startupschool.org

Y Combinator · Education · France

Medium risk. 5 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

Startup School, operated by Y Combinator, is a mature and well-established online educational platform aimed at early-stage startup founders. It offers a free course on how to start a startup, leveraging Y Combinator's extensive experience and network. The platform also includes a co-founder matching service and tools to track startup progress. The website is professionally designed with excellent content quality and strong branding consistency, targeting entrepreneurs and aspiring founders globally. Technically, the site uses modern JavaScript frameworks and analytics tools, hosted on Amazon AWS infrastructure. However, the website suffers from critical security shortcomings, notably the absence of a valid SSL/TLS certificate, which severely impacts secure communications and user trust. Other security features such as DMARC, DNSSEC, and CAA records are missing, and no cookie consent mechanism is present, indicating gaps in privacy compliance. Overall, the business credibility is high due to the association with Y Combinator, but the security posture requires urgent improvement to protect users and maintain trust.

Scanned

This is an earlier scan of startupschool.org. View the latest report

NIS2 and GDPR posture

GDPR outside view
25/ 100 · Critical
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 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

    • High

      Third-party services without privacy policy

      Detected services: Google Analytics, Cloudflare, Google APIs

      What to do: Document all third-party data sharing in your privacy policy

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

Keep watching startupschool.org

This scan found 17 issues across 5 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

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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
100
Security headers
70
Email security
70
DNS health
70
Network security
100
GDPR outside view
25
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

The business is positioned as a leading educational resource in the startup ecosystem, leveraging Y Combinator's brand and alumni network. Its free course model and co-founder matching platform create a strong value proposition for early-stage founders. The lack of direct contact information on the site suggests a focus on self-service and automated engagement. The use of Google and PostHog analytics indicates moderate user tracking for product improvement. The domain's 20-year age and consistent WHOIS data reinforce legitimacy. The platform's slow load time and high resource count may impact user experience and retention. Strategic partnerships appear limited to Y Combinator itself, with no other partner domains detected.

Security posture

The security maturity level is low due to the absence of a valid SSL certificate and lack of modern TLS protocol support, exposing users to potential interception risks. The presence of HSTS is positive but ineffective without HTTPS. Missing DMARC and DNSSEC records increase the risk of email spoofing and DNS attacks. No incident response or security policy information is publicly available, which may hinder timely vulnerability management. The site uses reputable analytics and tracking services but lacks explicit privacy and cookie consent mechanisms, raising compliance concerns. Overall, the security posture is a critical area for improvement to align with best practices and regulatory requirements.

Recommendations

  1. Immediately obtain and deploy a valid SSL/TLS certificate to enable HTTPS and secure user data.
  2. Enable and configure modern TLS protocols (TLS 1.2 and 1.3) and OCSP stapling for improved security and performance.
  3. Implement DMARC, DNSSEC, and CAA DNS records to enhance domain and email security.
  4. Add a clear cookie consent banner and privacy controls to comply with GDPR and other privacy regulations.
  5. Publish a security policy and incident response contact information to improve transparency and trust.
Technical notes

Notes

The website is built on a Ruby on Rails backend with a modern frontend using React components and jQuery. It leverages third-party services such as Google Analytics, Google Tag Manager, and PostHog for analytics and tracking. Hosting is provided by Amazon AWS, as indicated by DNS and IP data. The site loads a large number of resources (159) and has a slow load time (~19 seconds), suggesting optimization opportunities. Accessibility and SEO are basic to good, with proper meta tags and responsive design. The lack of CMS indicates a custom-built platform tailored to Y Combinator's needs. Technical debt is implied by the slow performance and missing security configurations, which should be addressed to improve user experience and security.
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. 73/100Medium28 findingsView report
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