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Security report for mas.to

mas.to · Technology · N/a

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

Security score

77/100

Risk levelLow

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

mas.to is an independent Mastodon server providing a federated social networking platform within the fediverse. It targets general users interested in decentralized microblogging and social interaction without ads or algorithms. The platform is based on Mastodon version 4.4.1 and offers features such as trending posts, hashtags, and live feeds. The website is well-branded and consistent, with a moderate user base of approximately 11,000 active users. Technically, the site uses modern web technologies including React and WebSockets for real-time streaming, with good mobile optimization and accessibility. Security posture is strong with HTTPS and script integrity checks, though explicit security headers and incident response contacts are missing. Privacy compliance is basic, with a privacy policy present but no cookie consent mechanism or terms of service. Overall, mas.to is a credible and trustworthy platform for decentralized social networking, though it could improve in compliance and security transparency.

Scanned

This is an earlier scan of mas.to. 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 mas.to

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
75
Security headers
75
Email security
75
DNS health
80
Network security
100
GDPR outside view
58
Average
77

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

mas.to operates as an important entity in the technology sector, specifically in social networking and federated platforms. It leverages the open-source Mastodon software to provide a community-driven social media experience. The business model is based on hosting and community engagement rather than direct monetization. The target audience includes privacy-conscious users and those interested in decentralized social media. The platform's market position is as one of many independent Mastodon instances, competing on speed, up-to-date software, and user experience. The lack of explicit business registration or contact details suggests a community or volunteer-driven operation. Partnerships or subsidiaries are not evident. Growth indicators include active user statistics and ongoing software updates. The platform's ecosystem includes links to other Mastodon instances and federated services.

Security posture

The security maturity of mas.to is moderate to good. The site enforces HTTPS with strong SSL configuration and uses script integrity attributes to prevent tampering. However, it lacks explicit security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options, which are recommended best practices. No vulnerability disclosure policy or security.txt file is present, limiting transparency for security researchers. Incident response contacts such as security@ or abuse@ emails are not provided. No exposed sensitive data or vulnerable libraries were detected in the HTML content. The platform's open-source nature and active community likely contribute to ongoing security improvements. Compliance with GDPR is partial, with a privacy policy but no cookie consent mechanism. Overall, the security posture is adequate but could be enhanced with formal policies and headers.

Recommendations

  1. Implement explicit security headers including CSP, HSTS, and X-Frame-Options to strengthen browser security.
  2. Publish a security.txt file and provide clear vulnerability disclosure and incident response contact information.
  3. Add a cookie policy and consent mechanism to improve privacy compliance and user transparency.
  4. Provide terms of service to clarify user rights and platform policies.
  5. Enhance contact information availability to improve business credibility and user trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
mas.to
Description
Hello! mas.to is a fast, up-to-date and fun Mastodon server.
Key services
Mastodon social networking, federated social media hosting
Content quality
good
Branding
consistent

Technology

Stack
Mastodon 4.4.1, Ruby on Rails (implied), React (implied by JS modules), WebSockets (streaming API)
Frameworks
Mastodon
Platforms
Fediverse
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Content Security Policy nonce used
  • 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 offering federated social networking.
  2. Content is user-generated posts with diverse topics.
  3. No direct company contact information or business registration details found.
  4. Privacy policy is present but basic; no cookie consent mechanism detected.
  5. No terms of service found on the page.
  6. Security practices are good with HTTPS and script integrity but lack explicit security headers.
  7. No advertising or tracking detected.
  8. No vulnerability disclosure or incident response contacts provided.
  9. WHOIS data shows privacy protection, typical for this type of service.
Technical notes

Notes

mas.to uses a modern technology stack based on Mastodon 4.4.1, which includes Ruby on Rails backend and React frontend components. The site employs WebSockets for real-time streaming of content. Performance is moderate with good mobile optimization and accessibility features. The use of integrity attributes on scripts and stylesheets indicates attention to security in technical implementation. SEO is supported by proper meta tags and Open Graph data. The site does not appear to use a traditional CMS but relies on Mastodon's built-in content management. Hosting provider details are not explicit but likely self-hosted or cloud-based. There is no evidence of technical debt or deprecated technologies. Opportunities exist to improve security headers and privacy compliance mechanisms to reduce technical risks.
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. 75/100 −3Medium27 findingsView report
  2. 78/100Low25 findingsView report
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