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Security report for mastodon.world

Mastodon · Technology · Iceland

Medium risk. 2 critical or high findings in GDPR outside view.

Security score

69/100

Risk levelMedium

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

Mastodon.world operates as a generic Mastodon server offering decentralized social networking services to a broad audience. It is part of the federated fediverse ecosystem, providing microblogging and content sharing capabilities. The platform is open source and targets users interested in privacy-respecting social media alternatives. The website is well-structured with good content quality and consistent branding, reflecting a medium-sized community with approximately 8,100 active users. Technically, the site uses modern frameworks such as Ruby on Rails and React, with a well-implemented security posture including HTTPS and security headers. However, privacy compliance could be improved by adding cookie consent mechanisms and terms of service documentation. Overall, the domain registration is privacy protected but justified given the nature of the service, and no suspicious patterns were detected.

Scanned

This is an earlier scan of mastodon.world. 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

2 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

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Keep watching mastodon.world

This scan found 18 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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  • 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
95
Security headers
75
Email security
65
DNS health
80
Network security
40
GDPR outside view
58
Average
69

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.world positions itself as an accessible Mastodon instance within the decentralized social media market. Its open source foundation and community-driven model provide competitive advantages in privacy and user control. The business model relies on hosting and community engagement rather than direct monetization. The target audience includes privacy-conscious users and those seeking alternatives to mainstream social networks. The platform benefits from partnerships with the broader Mastodon ecosystem and open source contributors. Growth indicators include active user counts and ongoing software updates. Strategic observations suggest focusing on enhancing privacy compliance and user trust to strengthen market position.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, clientTransferProhibited domain status, and multiple security headers. No exposed sensitive data or vulnerable libraries were detected in the analyzed content. However, the absence of explicit security policies and incident response contacts indicates room for improvement in transparency and readiness. The lack of cookie consent mechanisms may pose compliance risks under GDPR. Overall, the security maturity is good but could be enhanced by formalizing policies and improving user awareness.

Recommendations

  1. Implement a cookie consent banner to comply with privacy regulations.
  2. Publish clear terms of service and security policy pages to improve transparency.
  3. Enable DNSSEC on the domain to enhance DNS security.
  4. Provide explicit incident response contact information for security issues.
  5. Regularly audit third-party scripts and dependencies for vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mastodon
Description
Generic Mastodon server for anyone to use.
Key services
federated social networking, microblogging, content sharing
Content quality
good
Branding
consistent

Technology

Stack
Ruby on Rails, React, Webpack, JavaScript ES Modules
Frameworks
Ruby on Rails, React
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • clientTransferProhibited domain status
  • no exposed sensitive data in HTML

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 providing federated social networking.
  2. Content is publicly accessible and not blocked by WAF.
  3. No explicit privacy or cookie consent banners found, but privacy policy is present.
  4. WHOIS data shows privacy protection typical for this type of service.
  5. No direct company contact emails or phone numbers found.
  6. Site uses modern web technologies and good security headers.
  7. No advertising or tracking services detected.
  8. Content is safe for general audiences.
Technical notes

Notes

The website is built on a modern technology stack including Ruby on Rails backend and React frontend, leveraging ES modules and Webpack for efficient asset management. The site is mobile optimized with responsive design and accessibility considerations. Performance is moderate with room for optimization. Hosting details are not explicit but DNS uses cloudns.net nameservers. The site includes comprehensive meta tags and Open Graph data for SEO and social sharing. No CMS detected, indicating a custom or framework-based implementation. Technical risks are minimal but could be reduced by enabling DNSSEC and improving 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. 70/100Medium25 findingsView report
  2. 70/100 +2Medium25 findingsView report
  3. 68/100Medium27 findingsView report
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