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Security report for bildung.social

bildung.social · Education · N/a

Medium risk. 4 critical or high findings in Email security, SSL/TLS and 1 other check.

Security score

61/100

Risk levelMedium

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

bildung.social is an independent Mastodon social network instance focused on education and digital transformation topics. It provides a federated platform for users interested in these areas to connect and share content. The platform is based on the open-source Mastodon software, version 4.4.8, and is hosted using OVH Cloud infrastructure. The website demonstrates good content quality and user experience with a consistent brand and active user engagement. Technically, the site uses modern web technologies including React and ES modules, with a moderate performance profile and good mobile optimization. Security posture is solid with HTTPS enforced and some security best practices observed, though additional security headers could improve protection. Privacy compliance is basic with a privacy policy present but lacking cookie consent mechanisms and terms of service. WHOIS data is privacy protected, which is typical for such platforms, and does not raise immediate concerns. Overall, bildung.social is a legitimate, well-maintained social platform serving a niche educational community.

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

4 findings rated critical or high. Fix these first.

  1. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  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.

    • Critical

      Unable to retrieve SSL certificate

      Could not establish secure connection to retrieve certificate information

      What to do: Check if the server is accessible and SSL/TLS is properly configured

  3. 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

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

Keep watching bildung.social

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.

Daily monitoring

Recommended

€25per month

  • 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
0
Security headers
75
Email security
60
DNS health
75
Network security
100
GDPR outside view
58
Average
61

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

bildung.social operates as a small independent Mastodon instance targeting users interested in education and digital transformation. Its business model revolves around providing a free federated social networking service without advertising or tracking. The platform leverages open-source software and cloud hosting to maintain operational efficiency. The presence of an active administrator and a user base of approximately 767 monthly active users indicates a stable community. The site links to various external educational and technology-related domains, reinforcing its positioning. There is no evidence of commercial revenue streams or partnerships, suggesting a community-driven or non-profit orientation. The platform's competitive advantage lies in its focus on education and digital transformation within the fediverse, appealing to users seeking an ad-free, algorithm-free social experience.

Security posture

The website enforces HTTPS and uses integrity hashes on scripts and stylesheets, indicating attention to content security. However, it lacks explicit security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options, which are recommended to mitigate common web attacks. No exposed sensitive data or vulnerable libraries were detected in the provided content. The absence of a security.txt file or incident response contact information limits transparency for vulnerability reporting. Privacy compliance is partial, with a privacy policy present but no cookie consent mechanism or terms of service. Overall, the security posture is good but could be enhanced by implementing additional HTTP security headers and formalizing vulnerability disclosure processes.

Recommendations

  1. Implement and enforce HTTP security headers including CSP, HSTS, and X-Frame-Options to strengthen web security.
  2. Add a security.txt file and clearly publish incident response contact information to facilitate vulnerability reporting.
  3. Introduce a cookie consent mechanism to improve privacy compliance and user transparency.
  4. Publish terms of service to clarify user rights and platform policies.
  5. Consider enhancing WHOIS data transparency if appropriate to improve trust signals.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
bildung.social
Description
Bildung unter den Bedingungen der digitalen Transformation.
Key services
Social networking, Federated Mastodon server, Content sharing and discovery
Content quality
good
Branding
consistent

Technology

Stack
Mastodon 4.4.8, React, JavaScript ES modules, SVG icons, CSS with integrity hashes
Frameworks
Mastodon social network framework
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Content Security Policy implied by integrity attributes on scripts and stylesheets

Analytics and tracking

Tracking level
minimal
Privacy practices
good

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 focused on education and digital transformation.
  2. Content is accessible and not blocked by WAF or security challenges.
  3. WHOIS data is minimal and privacy protected, typical for this type of service.
  4. No explicit contact emails or phone numbers found on the site.
  5. Privacy policy is present but basic; no cookie consent mechanism detected.
  6. No terms of service or security policy pages found.
  7. No advertising or tracking services detected.
  8. Site uses HTTPS with good security practices but lacks some security headers.
  9. Content is safe and suitable for general audiences.
Technical notes

Notes

The website is built on the Mastodon social network platform version 4.4.8, utilizing React and modern JavaScript ES modules. It uses SVG icons and CSS with integrity attributes for security. Hosting is provided by OVH Cloud, as indicated by asset URLs. The site is mobile optimized with responsive design and basic accessibility features. Performance is moderate, with no major issues detected. SEO optimization is basic with standard meta tags and Open Graph data present. There is no CMS detected, as the site is a custom Mastodon instance. The technical stack is modern and appropriate for a federated social network, though some improvements in accessibility and SEO could be made.
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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