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Security report for marcel.app

Flying Elephant · Technology · Belgium

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

71/100

Risk levelMedium

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

Marcel is a SaaS platform operated by Flying Elephant, offering an all-in-one invoicing and communication solution tailored for Belgian small businesses, freelancers, students, and non-profit organizations. The platform emphasizes ease of use, privacy, and professional presentation, positioning itself as a niche player in the Belgian market. The website is well-designed, mobile-optimized, and provides clear navigation and relevant content to its target audience. Technically, the website employs modern web technologies including JavaScript, CSS, and integrates Google Analytics and Tag Manager for analytics and marketing purposes. It uses HTTPS with strong SSL configuration and implements a cookie consent mechanism compliant with GDPR. However, explicit security headers and published security policies are absent, representing an area for improvement. From a security perspective, the site shows good practices such as encrypted connections and privacy consent but lacks visible incident response contacts or vulnerability disclosure mechanisms. No critical vulnerabilities or suspicious content were detected. The WHOIS data aligns well with the website's branding and business claims, supporting legitimacy. Overall, Marcel presents a professional and trustworthy online presence with solid privacy compliance and user experience. Strategic enhancements in security policy transparency and security headers would further strengthen its security posture and trustworthiness.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 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

5 findings rated critical or high. Fix these first.

  1. 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';…

  2. GDPR outside view

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

    • 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 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

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

Keep watching marcel.app

This scan found 21 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

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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
15
Email security
85
DNS health
85
Network security
100
GDPR outside view
68
Average
71

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

Marcel targets a focused segment of the Belgian market, including freelancers, SMEs, students, and non-profits, offering integrated invoicing and communication tools. Its competitive advantage lies in localized services tailored to Belgian administrative and tax requirements, combined with ease of use and privacy focus. The business model is subscription-based SaaS with a free trial period, encouraging user adoption. The presence of customer logos and clear pricing indicates a mature go-to-market approach. The company operates under Flying Elephant, founded in 2017, suggesting steady growth and market presence. The lack of direct contact emails or phone numbers suggests a digital-first customer support approach. The partnership ecosystem is not explicitly detailed, but external domains indicate reliance on standard analytics and font providers.

Security posture

The website demonstrates a moderate to strong security posture with HTTPS enforced and a GDPR-compliant cookie consent mechanism. However, the absence of explicit security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options reduces defense-in-depth. No security or incident response policies are published, and no security.txt or vulnerability disclosure information is available, which limits transparency and readiness for incident handling. No exposed sensitive data or vulnerable libraries were detected in the HTML content. The use of third-party analytics is balanced with privacy consent, indicating awareness of privacy regulations. Overall, the security maturity is good but can be improved by adopting additional security headers and publishing formal security policies.

Recommendations

  1. Implement and enforce security headers including CSP, HSTS, and X-Frame-Options to enhance protection against common web attacks.
  2. Publish a dedicated security policy page and provide clear incident response contact information to improve transparency and trust.
  3. Consider adding a vulnerability disclosure policy or security.txt file to encourage responsible reporting of security issues.
  4. Enhance privacy compliance by detailing data retention policies and user rights more explicitly on the website.
  5. Maintain regular security audits and update third-party libraries to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Flying Elephant
Description
Van facturen tot nieuwsbrieven: het alles-in-één platform voor Belgische zelfstandigen, kmo’s, studenten en verenigingen.
Key services
Facturatie (Invoicing), Communicatie (Communication/newsletters)
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, CSS, Google Analytics, Google Tag Manager, Privacy Consent Script by Flying Elephant
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism implemented
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is in Dutch (nl) and targets Belgian small businesses and organizations.
  3. Strong emphasis on privacy and cookie consent compliance.
  4. No direct contact emails or phone numbers found; contact via web form.
  5. No explicit security or incident response policies published.
  6. Modern and professional website design with good SEO and accessibility.
  7. Use of Google Analytics and Tag Manager for analytics and marketing.
  8. No suspicious or malicious content detected.
Technical notes

Notes

The website uses a modern front-end stack with CSS and JavaScript, including asynchronous loading of Google Analytics and Tag Manager scripts for performance optimization. Fonts are loaded from Adobe Typekit and Google Fonts, ensuring good typography. The site is mobile responsive with good accessibility features and SEO meta tags including Open Graph and Twitter Cards for social sharing. No CMS or hosting provider is explicitly identified from the HTML content. Performance appears optimized with preloading of CSS and module preloading of JavaScript. The privacy consent mechanism is implemented via a custom script from Flying Elephant, indicating in-house or specialized privacy tooling. Overall, the technical implementation is robust with opportunities to improve security headers and incident response readiness.
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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