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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, niche technology project launched in late 2022 that provides a free and privacy-focused tool enabling users to share content easily on any Mastodon instance. The service simplifies sharing by remembering the user's Mastodon instance via cookies and does not require browser extensions or API access. The website is well designed with clear instructions and a straightforward user experience, targeting Mastodon users and website owners who want to facilitate sharing to Mastodon. Technically, the site uses Bootstrap and Font Awesome for styling and icons, hosted on Hover's DNS infrastructure. The site is mobile optimized and SEO friendly but lacks advanced security headers and DNSSEC, which are recommended for improved security. No analytics or tracking scripts were detected, aligning with the stated privacy-first approach. From a security perspective, the site uses HTTPS and has domain registration protections but lacks a privacy policy, cookie consent mechanism, and formal security or incident response policies. No vulnerabilities or malicious content were detected, but improvements in security headers and compliance documentation are advised. Overall, MastodonShare presents a trustworthy, privacy-conscious utility with moderate technical maturity and good business credibility for a small project. Strategic improvements in privacy compliance and security posture would enhance trust and resilience.

Scanned

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

€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

Email alerts on material changes and an exportable JSON history of every change.

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Full report

€39.90one-time

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Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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 occupies a niche in the social media utility space, specifically targeting Mastodon users who face challenges sharing content across diverse instances. Its competitive advantage lies in its simplicity, privacy focus, and no requirement for API keys or extensions. The business model appears to be a free service, possibly maintained by an individual or small team, with no evident monetization or advertising. The target customers are Mastodon users and website owners seeking to add Mastodon sharing functionality. The project is relatively new, founded in 2022, with no parent or subsidiary companies. The contact ecosystem is minimal but transparent, with direct email and Mastodon social contact provided. Growth potential depends on Mastodon's adoption and community engagement.

Security posture

The website demonstrates a basic to moderate security posture. It uses HTTPS, which is mandatory, and domain registration protections are in place. However, the absence of DNSSEC, security headers (such as Content-Security-Policy, X-Frame-Options), and formal privacy or security policies indicates room for improvement. No tracking or user data storage reduces privacy risks. The lack of incident response contacts or vulnerability disclosure mechanisms limits transparency in security management. Overall, the security maturity is adequate for a small utility site but should be enhanced to meet best practices and compliance standards.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security and prevent spoofing.
  2. Implement standard security headers including Content-Security-Policy, X-Content-Type-Options, and Strict-Transport-Security.
  3. Publish a clear privacy policy and cookie consent mechanism to improve GDPR compliance and user trust.
  4. Establish and publish a security policy and incident response contact information to enhance transparency and preparedness.
  5. Regularly audit and update third-party libraries and dependencies to mitigate vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Description
MastodonShare is a free, easy, and private tool that allows users to share content on any Mastodon instance without requiring browser extensions or apps. It facilitates sharing by asking users for their Mastodon instance and redirecting them to share content, storing the instance in a cookie for convenience.
Key services
Content sharing facilitation to Mastodon instances, Bookmarklet for easy sharing, Instance remembering via cookies
Content quality
good
Branding
consistent

Technology

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

Security

Observed score
70/100
Good practices seen
  • No user tracking
  • No Mastodon API access required
  • Use of HTTPS implied by URL

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 is a niche utility tool for Mastodon users.
  2. No privacy or cookie policies found, which is a compliance gap.
  3. No security headers detected in provided data; potential security improvement area.
  4. No analytics or tracking scripts detected, supporting privacy claims.
  5. Contact email provided but no phone or physical address.
  6. No signs of advertising or monetization.
  7. Simple, clean design with clear instructions and calls to action.
  8. No WAF or blocking mechanisms detected.
Technical notes

Notes

The website is built using Bootstrap and Font Awesome for UI styling and icons, with custom CSS for branding. It is hosted with Hover DNS services and uses HTTPS for secure communication. The site is mobile responsive and SEO optimized with proper meta tags and Open Graph data. No CMS or backend platform is detected from the HTML content. Performance is moderate with no obvious issues. Accessibility is basic but functional. The site does not use analytics or tracking scripts, aligning with its privacy claims. Technical debt appears low, but security enhancements and formal documentation are recommended to improve overall robustness.
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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