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Security report for mersen.com

Mersen · Energy · France

Medium risk. 5 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

51/100

Risk levelMedium

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

Mersen is a global industrial company specializing in electrical power and advanced materials, serving high-tech industries with customized solutions and key products. The company operates worldwide with over 50 industrial sites and 21 R&D centers across 33 countries, positioning itself as a leader in its sector. The website reflects a mature digital presence with comprehensive content, multi-language support, and active social media engagement. Technically, the site is built on Drupal 10 and leverages modern CDN and observability tools, but lacks a valid SSL certificate and modern TLS support, which is a critical security gap. Privacy and cookie policies are well implemented and GDPR compliant, but no explicit security policy or incident response information is provided. Overall, the website is professional and trustworthy but requires urgent improvements in SSL/TLS security to protect users and maintain credibility.

Scanned

NIS2 and GDPR posture

GDPR outside view
18/ 100 · Critical
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. GDPR outside view

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

    • Critical

      No HTTPS encryption

      GDPR requires appropriate security measures for personal data

      What to do: Implement SSL/TLS certificate for HTTPS

    • 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

  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

      No HTTPS Encryption

      Website does not use HTTPS encryption, making all data transmission vulnerable to interception

      What to do: Implement SSL/TLS certificate and redirect all HTTP traffic to HTTPS

  3. 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 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';…

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

Keep watching mersen.com

This scan found 16 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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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
55
Email security
50
DNS health
85
Network security
100
GDPR outside view
18
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

Mersen's market positioning as a global expert in electrical power and advanced materials is supported by its extensive manufacturing and R&D footprint. The business model focuses on B2B industrial solutions with a strong emphasis on innovation and sustainability. The company targets industrial clients in energy, transportation, and related sectors. Recent news and certifications indicate active engagement and compliance with industry standards. The website's multi-regional and multi-lingual structure supports global operations. The absence of phone and direct email contacts on the main site suggests a preference for contact forms and controlled communication channels. The company maintains a consistent brand image and trust signals through certifications, social media, and detailed corporate information.

Security posture

The website's security posture is currently weak due to the absence of a valid SSL certificate and lack of HTTPS enforcement, exposing visitors to potential interception risks. While some security headers like HSTS, X-Content-Type-Options, and X-Frame-Options are present, the lack of modern TLS protocols and OCSP stapling reduces security and performance. No vulnerability disclosure or incident response contacts are found, which limits transparency and readiness for security incidents. Privacy compliance is strong with clear policies and consent mechanisms. Immediate remediation of SSL/TLS issues is critical to improve security and user trust.

Recommendations

  1. Obtain and deploy a valid SSL/TLS certificate to enable HTTPS across the entire site.
  2. Enable and enforce modern TLS protocols (TLS 1.2 and TLS 1.3) and disable legacy protocols.
  3. Implement OCSP stapling and session resumption to enhance security and performance.
  4. Publish a dedicated security policy and incident response contact information to improve transparency.
  5. Regularly audit and update security headers and perform vulnerability assessments.
  6. Maintain and update privacy and cookie policies to ensure ongoing GDPR compliance.
  7. Consider adding direct company contact emails and phone numbers for improved accessibility.
  8. Enhance website performance metrics and monitor loading times for better user experience.
  9. Continue leveraging modern CMS and observability tools to maintain technical excellence.
  10. Promote security awareness internally and externally to strengthen overall security culture.

Contact details published on the site

Addresses
Legal name
Mersen
Technical notes

Notes

The website is built on Drupal 10, a modern and widely used CMS, ensuring a robust content management framework. It uses Fastly CDN for content delivery and Blackfire for observability, indicating a focus on performance monitoring. The site is mobile optimized and accessible with good SEO practices. However, the lack of a valid SSL certificate and disabled TLS protocols represent significant technical debt and security risk. The site uses JavaScript libraries for cookie consent management (Tarteaucitron) and includes multiple external tools for product configurators and resources. Performance data was not available, suggesting a need for further analysis. Overall, the technical infrastructure is solid but requires urgent security upgrades.
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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