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Security report for mastodonshare.com

Technology · N/a

Medium risk. 8 critical or high findings in Email security, Security headers and 2 other checks.

Security score

51/100

Risk levelMedium

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

MastodonShare is a small technology-focused web service launched in late 2022 that provides an easy, free, and privacy-respecting tool for users to share content on any Mastodon instance. The service targets Mastodon users and content creators who want a simple sharing mechanism without requiring browser extensions or Mastodon API access. The website is well-branded and consistent, offering clear instructions and a bookmarklet for ease of use. Technically, the site uses Bootstrap and Font Awesome for styling and icons, hosted on Hover's infrastructure. The site is mobile-optimized and performs moderately well, with good SEO practices evident from meta tags and Open Graph data. However, it lacks advanced security headers and DNSSEC, which could be improved to enhance security posture. From a security perspective, the site enforces HTTPS and claims no user tracking or data storage, which is positive for privacy. There are no detected vulnerabilities or exposed sensitive data. However, the absence of privacy and cookie policies, as well as security headers, represents compliance and security gaps. Contact information is provided via email and Mastodon social link, but no incident response or security policy is published. Overall, MastodonShare presents a trustworthy and niche utility service with a good baseline security posture but would benefit from enhanced compliance documentation and security hardening. The domain registration details are consistent and transparent, supporting legitimacy. Strategic recommendations include adding privacy and cookie policies, enabling DNSSEC, implementing security headers, and publishing a vulnerability disclosure process.

Scanned

This is an earlier scan of mastodonshare.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
50/ 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

8 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. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  3. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

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

Keep watching mastodonshare.com

This scan found 26 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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Full report

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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
15
Email security
60
DNS health
70
Network security
40
GDPR outside view
50
Average
51

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

MastodonShare operates in the technology sector, focusing on social media utility tools for the Mastodon decentralized social network ecosystem. Its business model is based on providing a free, privacy-first sharing tool that simplifies content sharing across diverse Mastodon instances. The target audience includes Mastodon users and website owners who want to integrate easy sharing capabilities. The company appears to be a small entity or individual developer without a parent company or subsidiaries. The service's competitive advantage lies in its simplicity, privacy focus, and lack of dependency on Mastodon APIs or browser extensions. Growth potential depends on Mastodon's user base expansion and adoption of decentralized social media. The contact ecosystem is limited but includes direct email and Mastodon social profile. No partnerships or payment processing relationships are evident.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enforced and no tracking or data storage, aligning with privacy best practices. However, the lack of DNSSEC, security headers (such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security), and absence of published security or incident response policies indicate areas for improvement. No vulnerabilities or exposed sensitive data were detected in the analysis. Compliance with GDPR is limited due to missing privacy and cookie policies. Incident response readiness is unclear due to lack of published contacts or procedures. Overall, the security culture appears minimal but adequate for a small utility service. Enhancing security documentation and technical controls would strengthen the posture.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Implement essential security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to mitigate common web attacks.
  3. Publish comprehensive privacy and cookie policies to improve GDPR compliance and user transparency.
  4. Establish and publish a vulnerability disclosure or security policy to facilitate responsible reporting and incident response.
  5. Consider adding minimal analytics with privacy-respecting configurations to monitor usage and improve service while maintaining user privacy.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Description
Easy, free and 100% private solution to allow your users to share content on their Mastodon.
Key services
Content sharing on Mastodon instances, Instance remembering via cookies, Bookmarklet for easy sharing
Content quality
good
Branding
consistent

Technology

Stack
Bootstrap, Font Awesome, Custom CSS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • No user tracking
  • No Mastodon API access required

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website provides a simple, niche utility service for Mastodon users.
  2. No privacy or cookie policies found, which is a compliance gap.
  3. No security headers detected, potential area for improvement.
  4. No analytics or tracking scripts detected, enhancing privacy.
  5. Contact email provided for support and inquiries.
  6. No advertising or affiliate marketing detected.
  7. Domain registration is recent but consistent and transparent.
  8. No WAF or blocking mechanisms detected; site fully accessible.
Technical notes

Notes

The website uses a straightforward technology stack including Bootstrap for responsive design and Font Awesome for icons, with custom CSS for branding. It is hosted on Hover's infrastructure, as indicated by the nameservers. The site is mobile-optimized and includes proper meta tags and Open Graph data for SEO and social sharing. Performance is moderate with no evident technical debt or deprecated technologies. No CMS or complex frameworks detected, indicating a lightweight and maintainable codebase. However, the absence of security headers and DNSSEC suggests some technical modernization opportunities. The site does not use analytics or tracking scripts, which aligns with its privacy-first approach but limits insight into user behavior.
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. 51/100Medium35 findingsView report
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