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Security report for seneca.nl

Seneca · Technology · Netherlands

Low risk. 2 critical or high findings in Security headers and GDPR outside view.

Security score

81/100

Risk levelLow

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

Seneca is a Dutch technology company specializing in modular web applications for digital customer engagement, including websites, intranet, online forms, enterprise search, and knowledge management. The company is positioned as a trusted provider with ISO 27001 certification and compliance with DigiD security assessments, indicating a strong commitment to information security. Their partnership with Decos further strengthens their market position. The website is professionally designed, mobile-optimized, and provides clear contact and privacy information, reflecting a mature digital presence. Technically, the website uses modern frameworks such as Bootstrap and jQuery, with Matomo analytics for privacy-conscious user tracking. The CMS appears custom or proprietary (Smartsite). Performance and accessibility are good, though some security headers are not explicitly detected, representing an opportunity for enhancement. The site enforces HTTPS and implements cookie consent mechanisms, supporting GDPR compliance. Security posture is strong with certifications and no visible vulnerabilities or exposed sensitive data. However, the absence of an incident response page or vulnerability disclosure policy suggests room for improvement in transparency and readiness. Overall, the website and business demonstrate a high level of professionalism and trustworthiness, suitable for their target market. Strategic recommendations include implementing security headers, publishing incident response and vulnerability disclosure information, and adding Terms of Service to enhance legal clarity and user trust.

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

2 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 X-Frame-Options header

      Prevents clickjacking attacks

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

  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

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

Keep watching seneca.nl

This scan found 14 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

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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
100
Security headers
85
Email security
70
DNS health
65
Network security
100
GDPR outside view
68
Average
81

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

Seneca operates in the technology sector, focusing on digital customer contact solutions through modular software products. Their business model centers on providing SaaS/web applications to organizations needing websites, intranet, forms, and knowledge management tools. The company targets medium to large organizations in the Netherlands and possibly broader markets. Their ISO 27001 certification and DigiD compliance provide competitive advantages in security-conscious sectors. The partnership with Decos suggests strategic growth and innovation capabilities. Revenue streams likely include software licensing, subscriptions, and support services. The website content and structure indicate a stable and professional operation with a clear focus on customer engagement and digital transformation.

Security posture

Seneca demonstrates a mature security posture with ISO 27001 certification and repeated successful DigiD security assessments, reflecting strong information security management. The website enforces HTTPS and uses cookie consent banners, supporting privacy compliance. No critical vulnerabilities or exposed sensitive data were detected in the HTML content. However, the lack of visible security headers such as CSP, HSTS, or X-Frame-Options indicates potential gaps in defense-in-depth. The absence of an incident response contact or vulnerability disclosure policy limits transparency and may delay response to security incidents. Overall, the security maturity is high but could be improved by adopting additional best practices and publicizing security processes.

Recommendations

  1. Implement comprehensive HTTP security headers including Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), and X-Frame-Options.
  2. Publish an incident response page or dedicated security contact email to improve transparency and readiness.
  3. Create and maintain a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  4. Add a Terms of Service page to clarify legal terms and user obligations.
  5. Regularly audit and update third-party scripts and dependencies to mitigate potential vulnerabilities.

Contact details published on the site

Addresses
Legal name
Seneca
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Seneca
Description
Seneca biedt oplossingen voor websites, intranet, formulieren en digitaal loket om klanten te bereiken, te raken en te betrekken met krachtige webapplicaties.
Key services
Formulierenserver (Online forms), Websites, Sociaal Intranet, Enterprise Search, Kennisbank (Knowledge base)
Content quality
good
Branding
consistent

Technology

Stack
Bootstrap, jQuery, Matomo Analytics, Mustache.js
Frameworks
Bootstrap
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • ISO 27001 certification
  • DigiD security assessment compliance
  • Cookie consent banner implemented
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Matomo
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Matomo
Marketing tools
Matomo Analytics
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with rich content and professional design.
  2. Strong emphasis on security compliance with ISO 27001 and DigiD assessments.
  3. Clear contact information and privacy/cookie policies present.
  4. No Terms of Service page found.
  5. Use of Matomo analytics indicates privacy-conscious tracking.
  6. No visible security headers detected in provided data; potential area for improvement.
  7. No incident response or vulnerability disclosure information found.
Technical notes

Notes

The website uses a modern technology stack including Bootstrap for responsive design, jQuery for DOM manipulation, and Mustache.js for templating. Matomo analytics is employed for privacy-focused user tracking. The CMS appears to be a custom or proprietary system (Smartsite). The site is mobile-optimized with good accessibility features such as skip links and ARIA labels. Performance is moderate with asynchronous loading of analytics scripts. No major technical debt or deprecated technologies were observed. Opportunities exist to enhance security headers and improve SEO metadata further. Hosting provider details are not explicitly available from the content.
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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