Skip to main content

Security report for kotlinlang.org

Kotlin Foundation · Technology · United States

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

Security score

70/100

Risk levelMedium

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

Kotlin Foundation, supported by JetBrains, operates the official Kotlin programming language website, providing comprehensive resources for developers including documentation, code playgrounds, and community engagement. The website positions Kotlin as a concise, multiplatform language suitable for server-side, mobile, web, and desktop applications, targeting software developers and enterprises adopting modern programming technologies. Technically, the site leverages modern frameworks such as Next.js, React, and integrates analytics and marketing tools like Google Tag Manager, Optimizely, and Marketo, hosted on AWS infrastructure. The site demonstrates excellent design quality, mobile optimization, and SEO practices, ensuring a professional and user-friendly experience. Security posture is strong with HTTPS enforcement, security headers, and domain registration protections, though DNSSEC is not enabled and no explicit security or privacy policies are published. Overall, the website is trustworthy and authoritative in the technology sector, though it would benefit from enhanced privacy compliance documentation and explicit contact information.

Scanned

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

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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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 kotlinlang.org

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.

Billed monthly to your card. Cancel anytime. See sample alerts.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

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
77
Security headers
40
Email security
80
DNS health
90
Network security
100
GDPR outside view
35
Average
70

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

Kotlin Foundation holds a strong market position as the steward of the Kotlin programming language, a widely adopted technology in multiplatform and server-side development. The business model centers on open-source language development supported by JetBrains, with revenue likely derived from tooling, enterprise support, and community services. The target audience includes developers, enterprises, and educational institutions. The website reflects a mature digital presence with active content updates and partnerships with major technology companies. The ecosystem includes integrations with GitHub and JetBrains, reinforcing credibility. Growth indicators include recent releases and active blog/news updates. Strategic observations suggest opportunities to improve transparency around privacy and security policies to align with evolving compliance standards.

Security posture

The website exhibits a mature security posture with enforced HTTPS, multiple security headers, and domain registration protections such as clientDeleteProhibited and clientTransferProhibited statuses. No vulnerabilities or exposed sensitive data were detected in the content. However, the absence of DNSSEC and lack of published security policies or incident response contacts represent gaps in security transparency and readiness. The use of third-party analytics and marketing tools introduces moderate tracking, but cookie consent mechanisms are implemented. Compliance with GDPR is not explicitly documented, indicating room for improvement in privacy governance. Overall, the security maturity is good but could be enhanced by formalizing security policies and enabling DNSSEC.

Recommendations

  1. Enable DNSSEC on the domain to strengthen DNS security and prevent spoofing.
  2. Publish a comprehensive privacy policy and terms of service linked prominently on the website.
  3. Provide verified contact information including security incident response contacts (e.g., security@ or abuse@ emails).
  4. Implement and publish a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  5. Review and minimize third-party tracking where possible to enhance user privacy and compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Kotlin Foundation
Description
Kotlin is a concise and multiplatform programming language by JetBrains. Enjoy coding and build server-side, mobile, web, and desktop applications efficiently.
Key services
Kotlin language development, Multiplatform programming support, Developer tools and playground, Documentation and community engagement
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, Google Fonts, Google Tag Manager, Optimizely, CookieHub, AWS DNS
Frameworks
Next.js
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • ClientDeleteProhibited and clientTransferProhibited domain status
  • No DNSSEC (not enabled)
  • Use of security headers
  • No exposed sensitive data detected

Analytics and tracking

Services
Google Tag Manager, Marketo
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
Marketo Munchkin, Optimizely
Marketing tools
Optimizely, Marketo
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 rich content and interactive code playground.
  2. Strong branding and consistent messaging about Kotlin programming language.
  3. Use of modern web technologies and performance optimizations.
  4. No explicit privacy or terms of service pages found in the provided content.
  5. Cookie consent mechanism implemented via CookieHub.
  6. No direct contact emails or phone numbers found on main pages.
  7. WHOIS data supports legitimacy and long-term presence.
  8. Security headers and HTTPS are properly configured.
  9. No signs of suspicious or malicious content.
Technical notes

Notes

The website is built on a modern, performant tech stack including Next.js and React, with integration of Google Fonts and various analytics and marketing tools. Hosting is via AWS, indicated by DNS nameservers. The site is mobile optimized, accessible, and SEO friendly with proper meta tags and Open Graph data. The code examples and interactive playground demonstrate advanced frontend capabilities. No technical debt or legacy technologies were detected. Performance is fast with preloading and deferred scripts. The main technical risk lies in reliance on multiple third-party scripts which may impact privacy and security if not managed carefully.
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. 79/100Low26 findingsView report
Reviews of this site

Share your experience with kotlinlang.org. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review kotlinlang.org.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.