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Security report for mastodon.green

Mastodon.green · Technology · N/a

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

Security score

67/100

Risk levelMedium

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

Mastodon.green is an independent Mastodon server focused on providing a federated social networking platform with an environmental mission to plant trees while users engage. The site targets a general audience interested in decentralized social media, originally aimed at EU users but now open globally. The platform offers trending posts, hashtags, and user profiles, leveraging the open-source Mastodon software version 4.4.7. Technically, the site uses modern web technologies including React, ES modules, and secure HTTPS connections with script integrity checks, ensuring a good user experience and mobile optimization. Security posture is solid with HTTPS and content security policies implied, though explicit security headers and incident response policies are absent. Privacy compliance is moderate with a privacy policy present but lacking cookie consent mechanisms and terms of service. WHOIS data is privacy protected, typical for such community-run servers, and does not detract from the site's legitimacy. Overall, Mastodon.green presents a trustworthy, well-maintained social platform with room for improvement in security transparency and privacy controls.

Scanned

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 17 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
80
Email security
65
DNS health
85
Network security
40
GDPR outside view
58
Average
67

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 Mastodon instance within the federated social media ecosystem. Its competitive advantage lies in its environmental branding and community focus. The business model is based on providing free social networking services without ads or algorithms, relying on community support and possibly donations. The target customers are privacy-conscious social media users and those interested in decentralized platforms. The site shows active user engagement with nearly 1000 active users monthly. Partnerships with the broader Mastodon and fediverse community are evident through external links to joinmastodon.org and GitHub. The platform's open-source nature and transparent admin contact foster trust and community growth. Growth indicators include active trending content and ongoing software updates. Strategic observations suggest focusing on enhancing privacy and security policies to strengthen user trust further.

Security posture

The security maturity of Mastodon.green is moderate to good. The site enforces HTTPS and uses script integrity attributes, indicating attention to secure content delivery. However, the absence of explicit security headers such as HSTS, X-Frame-Options, and X-Content-Type-Options represents a gap in defense-in-depth. No vulnerabilities or exposed sensitive data were detected in the analyzed content. Privacy compliance is partial, with a privacy policy present but lacking cookie consent and terms of service. Incident response and vulnerability disclosure mechanisms are not publicly documented, which could delay response to security incidents. The use of modern frameworks and libraries reduces risk from outdated components. Recommendations include adding security headers, publishing a security policy, and implementing cookie consent to improve compliance and user trust.

Recommendations

  1. Implement and enforce security headers including HSTS, X-Frame-Options, and X-Content-Type-Options.
  2. Add a visible terms of service page to clarify user rights and responsibilities.
  3. Introduce a cookie consent banner/mechanism to comply with GDPR and enhance privacy transparency.
  4. Publish a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
  5. Enhance accessibility features to improve inclusivity and compliance with standards.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mastodon.green
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, Federated Mastodon server hosting, User profiles and timelines, Trending posts and hashtags
Content quality
good
Branding
consistent

Technology

Stack
Mastodon 4.4.7, React, JavaScript ES Modules, SVG icons, CSS with integrity hashes, WebSockets (wss://mastodon.green)
Frameworks
Ruby on Rails (implied by mastodon platform), React
Platforms
Fediverse, Mastodon
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Content Security Policy (implied by nonce in meta tag)
  • Use of integrity attributes on scripts and stylesheets

Analytics and tracking

Tracking level
minimal
Privacy practices
good

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 impact (planting trees).
  2. Content is user-generated social posts with trending topics.
  3. No direct company contact emails or phone numbers found.
  4. Privacy policy is present but no cookie consent banner detected.
  5. No terms of service page found.
  6. No explicit security or incident response policies published.
  7. Site uses modern web technologies and is mobile optimized.
  8. No advertising or tracking detected in the HTML content.
  9. WHOIS data is privacy protected with no registrar details beyond Identity Digital Inc.
  10. Site content is accessible with no WAF or blocking detected.
Technical notes

Notes

The website is built on the Mastodon platform version 4.4.7, utilizing React and modern JavaScript modules for dynamic content rendering. The use of SVG icons and CSS with integrity hashes indicates good front-end security practices. The site is mobile optimized and provides a responsive user interface with clear navigation. Performance is moderate, with multiple preloaded scripts and stylesheets ensuring smooth user experience. Hosting details are not explicitly disclosed, but WebSocket usage indicates real-time communication capabilities. No CMS is detected beyond the Mastodon platform itself. The technical stack is modern and well-maintained, though opportunities exist to improve security headers and privacy compliance mechanisms.
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. 66/100Medium27 findingsView report
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