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Security report for mastodon.green

Contact Privacy Inc. Customer 0155125177 · Technology · Canada

Medium risk. 3 critical or high findings in GDPR outside view and SSL/TLS.

Security score

66/100

Risk levelMedium

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

Mastodon.green is an independent Mastodon social networking server focused on environmental themes and originally targeting EU users but now open globally. It offers a federated microblogging platform leveraging the open source Mastodon software, enabling users to participate in the fediverse with a privacy-conscious and ad-free experience. The website is well designed with good content relevance and clear navigation, supporting a general audience interested in social networking and environmental topics. Technically, the site uses modern web technologies including React and Ruby on Rails, hosted on Hover DNS services, with good mobile optimization and moderate performance. Security posture is adequate with HTTPS enforced and domain transfer protections, but lacks security headers and cookie consent mechanisms. WHOIS data shows privacy protection consistent with the business type and domain age appropriate for the service. Overall, Mastodon.green presents a trustworthy and professional platform with room for security and privacy compliance improvements.

Scanned

This is an earlier scan of mastodon.green. View the latest report

NIS2 and GDPR posture

GDPR outside view
58/ 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

3 findings rated critical or high. Fix these first.

  1. 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

  2. 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

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Keep watching mastodon.green

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
75
Email security
65
DNS health
80
Network security
40
GDPR outside view
58
Average
66

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

Mastodon.green operates as a small independent social network server within the federated Mastodon ecosystem, targeting environmentally conscious users and the EU community. Its business model is based on providing free social networking services without ads or tracking, relying likely on donations or community support. The platform's competitive advantage lies in its niche focus on planting trees and environmental awareness, combined with the decentralized nature of Mastodon. The site integrates with the broader fediverse, enhancing its reach and user engagement. Growth indicators include an active user base of approximately 1,000 monthly active users and visible administrative presence. The ecosystem includes links to official Mastodon resources and EU-related content, but no direct commercial partnerships or subsidiaries are evident.

Security posture

The security maturity of Mastodon.green is moderate. HTTPS is properly implemented, and domain registration includes client transfer and update prohibitions, reducing risk of hijacking. However, the absence of DNSSEC and security headers such as Content-Security-Policy and X-Frame-Options weakens defense-in-depth. No exposed sensitive data or vulnerable libraries were detected in the analyzed content. The site lacks published security policies, incident response contacts, or vulnerability disclosure mechanisms, which limits transparency and readiness. Privacy compliance is partial, with a privacy policy present but no cookie consent or terms of service. Overall, the platform demonstrates basic security hygiene but should enhance policies and technical controls to improve resilience and user trust.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Implement standard security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Publish a comprehensive terms of service and cookie policy with consent mechanisms to improve privacy compliance.
  4. Establish and publicize a security policy and incident response contact to enhance transparency and trust.
  5. Regularly audit and update third-party libraries and dependencies to mitigate vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Contact Privacy Inc. Customer 0155125177
Description
Plant trees while you use Mastodon. A server originally for people in the EU, but now open for anyone in the world
Key services
Social networking, Microblogging, Federation with fediverse
Content quality
good
Branding
consistent

Technology

Stack
React (inferred from JS modules), JavaScript ES Modules, SVG, CSS
Frameworks
Mastodon (open source social network)
Platforms
Fediverse
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • Client transfer and update prohibited domain status

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

Advertising

Transparency
poor

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website is a Mastodon instance focused on environmental and EU community themes.
  2. Content is user-generated social posts with no adult or malicious content.
  3. No explicit contact emails or phone numbers found on public pages.
  4. No cookie consent or terms of service pages detected.
  5. Uses modern web technologies and open source Mastodon platform.
  6. WHOIS privacy protection is used but justified for this type of service.
  7. No security headers detected; opportunity for security improvements.
  8. No advertising or tracking detected; privacy friendly approach.
Technical notes

Notes

The website is built on the Mastodon open source platform, leveraging Ruby on Rails backend and React-based frontend with modular JavaScript. It uses SVG for icons and responsive CSS for mobile optimization. Hosting DNS is managed by Hover, with domain registration privacy protection enabled. Performance is moderate with multiple module preloads and asynchronous scripts, indicating modern web practices. Accessibility is basic with some ARIA labels and keyboard navigation support. SEO is supported by meta tags and Open Graph data. However, the lack of security headers and cookie consent indicates technical debt in security and privacy areas. Overall, the technical infrastructure is solid but can benefit from enhanced security configurations and privacy features.
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. 67/100Medium25 findingsView report
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