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Security report for mastodon.cloud

Distributed Social Network Organization LLC. · Technology · Japan

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

Security score

73/100

Risk levelMedium

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

Mastodon.cloud is a publicly accessible instance of the decentralized Mastodon social network, maintained by Sujitech, LLC and registered under Distributed Social Network Organization LLC. The platform offers a federated social networking service with an active user base of approximately 2,100 monthly active users. The website provides a modern, responsive interface with good content quality and user engagement, supporting multimedia posts and trending topics. Technically, it leverages the Mastodon Ruby on Rails framework, uses Cloudflare for DNS, and employs WebSocket for real-time streaming. Security measures include HTTPS enforcement, CSRF protection, and script integrity checks, though DNSSEC is not enabled and explicit security policies are absent. Privacy compliance is basic, with a privacy policy present but lacking cookie consent mechanisms and GDPR-specific indicators. Business credibility is supported by transparent WHOIS data, consistent domain registration, and clear branding. Overall, the site is trustworthy and functional but could improve privacy and security transparency.

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

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

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

Keep watching mastodon.cloud

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

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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
85
Email security
60
DNS health
65
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

Mastodon.cloud operates as a federated social network instance targeting general users interested in decentralized social media. Its business model is community-driven, offering free account creation and content sharing within the Mastodon ecosystem. The platform benefits from open-source software and a growing user base, positioning it as a significant player among Mastodon instances. Partnerships with the broader Mastodon community and links to the official Mastodon website and GitHub repository enhance its ecosystem integration. The absence of commercial advertising or affiliate programs suggests a focus on community and service rather than monetization. Growth indicators include active user engagement and trending topics. Strategic observations highlight the importance of enhancing privacy compliance and security policies to maintain user trust and regulatory alignment.

Security posture

The website demonstrates a mature security posture with HTTPS enforced, CSRF tokens implemented, and script integrity attributes present, reducing risks of common web attacks. However, the lack of DNSSEC and absence of published security policies or incident response contacts represent gaps in security transparency and readiness. No vulnerabilities or exposed sensitive data were detected in the analyzed content. Privacy compliance is limited, with no cookie consent mechanism and minimal GDPR indicators. Incident response and vulnerability disclosure mechanisms are not publicly available, which could hinder timely security issue reporting. Overall, the security maturity is good but would benefit from formalized policies and enhanced DNS security.

Recommendations

  1. Enable DNSSEC on the domain to strengthen DNS security and prevent spoofing.
  2. Publish a comprehensive security policy and incident response plan accessible on the website.
  3. Implement a cookie consent banner or mechanism to comply with GDPR and other privacy regulations.
  4. Add a vulnerability disclosure policy and security.txt file to facilitate responsible reporting.
  5. Provide clear contact information for security and abuse reporting to improve trust and responsiveness.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Distributed Social Network Organization LLC.
Description
Mastodon.cloud is a decentralized social network server maintained by Sujitech, LLC. It welcomes everyone who follows its code of conduct and provides a platform for social interaction within the Mastodon network.
Key services
Decentralized social networking, User profiles, Content sharing, Trending topics
Content quality
good
Branding
consistent

Technology

Stack
Ruby on Rails (Mastodon), JavaScript, Cloudflare DNS, WebSocket (wss)
Frameworks
Mastodon (Ruby on Rails)
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • CSRF protection
  • Use of integrity attributes on scripts and stylesheets

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 decentralized social networking.
  2. Content is user-generated posts with diverse topics and media.
  3. No explicit privacy or cookie consent mechanisms detected.
  4. Security best practices are partially implemented but could be improved.
  5. WHOIS data is transparent and consistent with the business.
  6. No signs of malicious or suspicious activity detected.
Technical notes

Notes

The website is built on the Mastodon open-source platform using Ruby on Rails and JavaScript, with Cloudflare providing DNS services. It uses WebSocket for real-time communication and includes modern web development practices such as script integrity checks and CSRF protection. Performance is moderate with good mobile optimization and accessibility features. SEO is supported by proper meta tags and Open Graph data. The site lacks a traditional CMS and appears to be custom-built for Mastodon's federated social networking. Technical risks are minimal but include the absence of DNSSEC and incomplete privacy compliance features. Opportunities exist to modernize privacy and security disclosures and enhance user trust through transparency.
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

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