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Security report for gultsch.social

Daniel Gultsch · Technology · Germany

Medium risk. 4 critical or high findings in Email security, GDPR outside view and 1 other check.

Security score

63/100

Risk levelMedium

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

The website gultsch.social is an independent Mastodon instance operated by Daniel Gultsch, a recognized figure in the open source and XMPP communities. The platform emphasizes ethical design, decentralization, and user data ownership, catering to users interested in federated social networking. The business model is community-driven without advertising, focusing on technology enthusiasts and privacy-conscious users. The domain registration and website content are consistent, reflecting a small but credible operation. Technically, the site runs Mastodon 4.4.0 with modern web technologies including Ruby on Rails and React. The infrastructure appears well-maintained with HTTPS enforced and a moderate performance profile. Mobile optimization and accessibility are adequate, though some SEO and security header enhancements could improve the overall technical posture. Security-wise, the site benefits from HTTPS and domain transfer protections but lacks DNSSEC and explicit security policies. No vulnerabilities or exposed sensitive data were detected. Privacy compliance is partial, with a basic privacy policy but no cookie consent mechanism. No incident response or vulnerability disclosure information is published. Overall, the site presents a low-risk profile with strong business credibility and technical maturity for its scale. Strategic improvements in security headers, privacy compliance, and incident response transparency would enhance trust and resilience.

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. 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

  3. 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 Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

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

Keep watching gultsch.social

This scan found 22 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
72
Security headers
75
Email security
60
DNS health
70
Network security
40
GDPR outside view
58
Average
63

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention gultsch.social, from OffSeq Breach.

No leaked records found

Breach holds no records for gultsch.social right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

Monitor on Breach (opens in a new tab)

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Daniel Gultsch operates this Mastodon instance as part of his broader involvement in open communication protocols and software projects like Conversations.im and Ltt.rs. The business is positioned as a niche, privacy-focused social platform within the fediverse, targeting technically savvy users valuing decentralization. Revenue streams are not evident, suggesting a volunteer or community-supported model. The ecosystem includes partnerships with open source communities and standards organizations. Growth indicators include active development and community engagement, though user base is currently very small. Strategic observations highlight the importance of maintaining open standards and ethical design to differentiate from commercial social networks.

Security posture

The security maturity level is moderate to good, with HTTPS enforced and domain transfer protections in place. The absence of DNSSEC and some security headers represents areas for improvement. No critical vulnerabilities or exposed credentials were found. Compliance gaps include lack of published incident response contacts and vulnerability disclosure mechanisms. Data protection practices appear sound but could benefit from clearer policies and cookie consent. Incident response readiness is unclear due to missing contact channels. The security culture is implied by the operator's involvement in open standards and privacy-focused projects, indicating a positive security mindset.

Recommendations

  1. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  2. Publish a security.txt file to facilitate responsible vulnerability disclosure.
  3. Add and enforce security headers such as Content-Security-Policy and X-Frame-Options.
  4. Implement a cookie consent mechanism to improve privacy compliance and user transparency.
  5. Provide clear incident response and security contact information on the website.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Daniel Gultsch
Description
Mastodon instance hosted on gultsch.social, an independent Mastodon server focused on ethical design, decentralization, and no ads or corporate surveillance. The profile owner is a project lead on Conversations.im and Ltt.rs, active in XMPP standards.
Key services
Mastodon social networking, Hosting user profiles, Federated social media participation
Content quality
good
Branding
consistent

Technology

Stack
Mastodon 4.4.0, Ruby on Rails, React, JavaScript ES Modules, WebSockets
Frameworks
Ruby on Rails, React
Platforms
Fediverse, Mastodon
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Domain status clientTransferProhibited
  • No exposed sensitive data in HTML

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 instance with a single active user.
  2. Content is focused on open source, decentralized social networking, and XMPP standards.
  3. No commercial advertising or tracking detected.
  4. Privacy policy is present but basic; no cookie consent mechanism found.
  5. No explicit security or incident response policies published.
  6. WHOIS data is consistent and domain is relatively new but appropriate for the project.
  7. No signs of suspicious or malicious activity.
Technical notes

Notes

The website uses a modern tech stack centered on Mastodon 4.4.0, Ruby on Rails, and React with ES modules. The infrastructure supports WebSocket streaming and responsive design. Performance is moderate with room for optimization. The site lacks a traditional CMS, relying on Mastodon's built-in content management. Hosting appears stable with INWX GmbH as registrar and multiple name servers. Technical debt is minimal given the active development and recent domain creation. Opportunities exist to improve SEO, accessibility, and security headers. Technical risks are low but include missing DNSSEC and incomplete privacy mechanisms which could impact compliance and trust.
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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