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Security report for mstdn.social

Mastodon · Technology · N/a

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

Mstdn.social is an independent Mastodon server providing a general-purpose federated social networking platform with a 500 character limit and support for all languages. It serves a large community with approximately 12,000 active users monthly, positioning itself as a significant node within the decentralized fediverse ecosystem. The platform is open source, with its codebase publicly available on GitHub, enhancing transparency and trust. Technically, the website employs a modern tech stack including Ruby on Rails backend and React frontend, leveraging progressive web app features for excellent mobile optimization and user experience. The site is well-structured with proper meta tags and accessibility considerations, ensuring good SEO and usability. Performance is fast, and the site uses HTTPS with integrity checks on scripts, indicating a mature digital infrastructure. From a security perspective, the site enforces HTTPS and avoids exposing sensitive data. However, it lacks explicit security headers and publicly available incident response or vulnerability disclosure policies, which could be improved to enhance security posture. Privacy compliance is strong, with comprehensive privacy and terms of service pages, and minimal user tracking or advertising. Overall, mstdn.social presents a trustworthy and well-maintained platform with a strong community focus. Strategic recommendations include implementing additional security headers, publishing vulnerability disclosure information, and enhancing incident response transparency to further strengthen security and compliance.

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

      SSL Certificate Expires Soon

      SSL certificate expires in 1 days

      What to do: Renew SSL certificate before expiration

      • NIS2 21(2)(h)
      • IR 2024/2690 9.2(c): Implementing Regulation (EU) 2024/2690, Annex point 9.2(c): Cryptography
      • NIST SC-17: NIST SP 800-53 Rev. 5 SC-17: Public Key Infrastructure Certificates

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

Keep watching mstdn.social

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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  • 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
85
Security headers
80
Email security
55
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

Mstdn.social operates as an important entity within the technology sector, specifically in decentralized social networking. Its business model revolves around providing a free, open-source federated social platform that attracts a diverse global audience. The platform's competitive advantage lies in its integration within the fediverse, allowing interoperability with other Mastodon instances and decentralized networks. Revenue streams are not explicit but likely include donations or sponsorships common to open-source projects. The user base size and active engagement indicate healthy growth and community trust. The ecosystem includes partnerships with other fediverse nodes and open-source contributors, supporting sustainable operations.

Security posture

The security maturity of mstdn.social is moderate to high. The site uses HTTPS exclusively, ensuring encrypted communications. It employs modern web technologies with script integrity checks, reducing risks of tampering. However, the absence of key security headers such as Content-Security-Policy and Strict-Transport-Security reduces defense-in-depth. No public incident response or vulnerability disclosure mechanisms were found, which could delay mitigation of security issues. Privacy policies are comprehensive and GDPR compliant, reflecting good data protection practices. No vulnerabilities or exposed sensitive data were detected in the analyzed content. Overall, the platform demonstrates a solid security foundation but would benefit from enhanced security controls and transparency.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  2. Publish a clear vulnerability disclosure policy and consider adding a security.txt file to facilitate responsible reporting.
  3. Establish and communicate an incident response plan and contact channels for security issues.
  4. Enhance user privacy controls and consider implementing a cookie consent mechanism to improve compliance.
  5. Maintain transparency with users by providing more detailed business and security information on the website.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mastodon
Description
A general-purpose Mastodon server with a 500 character limit. All languages are welcome.
Key services
federated social networking, microblogging, content sharing
Content quality
good
Branding
consistent

Technology

Stack
Ruby on Rails, React, Webpack, JavaScript ES Modules, Service Workers, Progressive Web App
Frameworks
Mastodon (Ruby on Rails based)
Platforms
Fediverse, Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of integrity attributes on scripts and stylesheets

Analytics and tracking

Tracking level
minimal
Privacy practices
excellent

Advertising

Transparency
excellent

Site quality

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

Key observations

  1. Website is a Mastodon social network instance with active user engagement.
  2. Content is accessible and not blocked by WAF or security challenges.
  3. WHOIS data is privacy protected, common for such services.
  4. No direct company contact emails or phone numbers found.
  5. Privacy and terms of service pages are present and comprehensive.
  6. No advertising or tracking scripts detected.
  7. Good technical implementation with modern web technologies.
Technical notes

Notes

The website is built on a robust and modern technology stack featuring Ruby on Rails backend and React frontend components. It uses Webpack for asset bundling and supports progressive web app capabilities, ensuring excellent mobile responsiveness and performance. The site includes integrity attributes on scripts and stylesheets, enhancing security. SEO is well addressed with appropriate meta tags and Open Graph data. Accessibility features are present, supporting a broad user base. Hosting details are not explicit but the infrastructure appears stable and performant. Opportunities exist to improve technical security configurations and to document operational policies more explicitly.
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. 68/100 +2Medium26 findingsView report
  2. 66/100Medium24 findingsView report
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