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Security report for startupschool.org

Y Combinator · Technology · N/a

Medium risk. 4 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

Startup School, operated by Y Combinator, is a leading free online educational platform designed to help early-stage startup founders learn how to build successful companies. The website offers a structured 7-week curriculum featuring lessons from prominent YC partners and startup founders, along with tools such as co-founder matching and weekly progress tracking. The platform targets aspiring entrepreneurs and side project developers, positioning itself as a trusted resource in the startup ecosystem. Technically, the site leverages Ruby on Rails, modern JavaScript libraries, and analytics tools like Google Analytics and PostHog, delivering a responsive and well-structured user experience. Security-wise, the site enforces HTTPS and uses CSRF tokens but lacks some advanced security headers and explicit cookie consent mechanisms. WHOIS data is unavailable due to privacy protection, but the strong brand association and content quality support the domain's legitimacy. Overall, the website demonstrates a mature digital presence with excellent content quality and business credibility, though improvements in privacy compliance and security headers are recommended.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 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

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 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 SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching startupschool.org

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.

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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
75
Security headers
70
Email security
70
DNS health
70
Network security
100
GDPR outside view
53
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 website benefits from its affiliation with Y Combinator, a globally recognized startup accelerator, which enhances its market position and trustworthiness. Its business model focuses on providing free educational content and community tools to early-stage founders, fostering startup growth and innovation. The platform's co-founder matching service and weekly tracking tools add value beyond traditional online courses. The target audience includes new entrepreneurs and side project founders worldwide. The site’s content and testimonials from YC alumni reinforce its credibility and effectiveness. While revenue streams are not explicit, the platform likely supports YC’s broader ecosystem and brand. Partnerships are primarily internal within Y Combinator’s network, with no external commercial partners identified.

Security posture

The website maintains a solid security baseline with HTTPS enforced and CSRF protection on forms. However, the absence of key security headers such as Content-Security-Policy and X-Frame-Options represents an area for improvement. No vulnerabilities or exposed sensitive data were detected in the HTML content. Privacy compliance is partially addressed through a comprehensive privacy policy linked to Y Combinator’s main site, but the lack of a cookie consent mechanism is a compliance gap under GDPR. Incident response and security policy information are not publicly available, which could hinder transparency. Overall, the security posture is good but could be enhanced by implementing recommended headers, explicit incident response contacts, and cookie consent.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to enhance protection against common web attacks.
  2. Add a visible cookie consent banner/mechanism to comply fully with GDPR and other privacy regulations.
  3. Publish a dedicated security policy and incident response contact information to improve transparency and trust.
  4. Consider providing explicit company contact information on the website to enhance business credibility and user trust.
  5. Regularly audit third-party scripts and analytics tools to ensure no vulnerable libraries or privacy issues arise.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Y Combinator
Description
Startup School is a free online course on how to start a startup, providing essential advice from Y Combinator partners and industry leaders. It offers a 7-week curriculum to help founders plan MVPs, funding, growth, team leadership, and more.
Key services
Online startup course, Co-founder matching platform, Weekly progress tracking tool
Content quality
excellent
Branding
consistent

Technology

Stack
Ruby on Rails, JavaScript, jQuery, PostHog analytics, Google Analytics, Algolia (search), Material Icons, Ionicons
Frameworks
Ruby on Rails
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of CSRF tokens in forms

Analytics and tracking

Services
Google Analytics, PostHog
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
PostHog
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 branding and trust signals from Y Combinator association
  3. Comprehensive educational content targeting startup founders
  4. Use of modern web technologies and analytics tools
  5. Lack of explicit contact emails or phone numbers on the main page
  6. No visible cookie consent mechanism despite GDPR compliance claims
  7. WHOIS data unavailable, likely due to privacy protection
Technical notes

Notes

The website is built on a Ruby on Rails backend with a modern JavaScript frontend utilizing jQuery and module preloading for performance. It integrates third-party services such as Google Analytics, Google Tag Manager, and PostHog for analytics and user behavior tracking. The site uses CDN-hosted icon fonts and static assets for efficient delivery. Performance is moderate with good mobile optimization and accessibility features, though accessibility could be improved further. SEO is well addressed with proper meta tags and Open Graph data. The absence of a CMS suggests a custom-built platform tailored for the Startup School program. Hosting details are not explicitly found but likely managed by Y Combinator infrastructure or a cloud provider.
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. 73/100Medium24 findingsView report
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