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Security report for on-res.com

Computer Online AG · Transportation · Switzerland

Medium risk. 8 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

50/100

Risk levelMedium

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

The website on-res.com is operated by Computer Online AG, a Swiss company specializing in providing an online reservation and administration system tailored for aviation clubs, flight schools, and charter services. The platform offers real-time flight scheduling, digital flight logs approved by Swiss aviation authorities (BAZL), technical maintenance logs, and integration with Swiss accounting software (Comatic). The business model is that of an Application Service Provider (ASP), targeting niche aviation organizations primarily in Switzerland. The company has been established since 2002, indicating a mature presence in its market segment. Technically, the website employs basic web technologies including HTML, CSS, JavaScript, and jQuery 2.2.4. It supports multiple browsers and mobile devices such as iPads and iPhones, though mobile optimization is basic. The site lacks modern CMS frameworks and advanced SEO or accessibility features, reflecting a functional but dated technical infrastructure. From a security perspective, the domain is registered with a reputable registrar and has a long history, supporting legitimacy. However, the site lacks DNSSEC, security headers, and published privacy or cookie policies, which are notable compliance and security gaps. No WAF or blocking mechanisms are detected, and no analytics or tracking scripts are present, indicating minimal user tracking. Contact information is clearly provided, enhancing trust. Overall, the website scores moderately on content quality and business credibility but lower on technical implementation and privacy compliance. Strategic improvements in security headers, privacy documentation, and modernizing the technical stack would enhance the site's security posture and user trust.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
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. 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 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

    • 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

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

Keep watching on-res.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

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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
67
Security headers
15
Email security
70
DNS health
70
Network security
40
GDPR outside view
35
Average
50

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

Computer Online AG occupies a specialized niche in the aviation software market, providing tailored solutions for flight reservation and administration. Its competitive advantage lies in integration with Swiss accounting software and compliance with aviation authority requirements. The business model as an ASP allows recurring revenue through annual fees per aircraft or reservation object. The target customers are aviation clubs, flight schools, and charter operators primarily in Switzerland. The company demonstrates stable operations with a long domain history and references to existing users. Partnerships, notably with Comatic, strengthen its ecosystem. Growth potential may be limited by niche focus but benefits from strong domain expertise and regulatory alignment.

Security posture

The current security posture is moderate but with room for improvement. The domain registration is consistent and trustworthy, but the absence of DNSSEC and security headers weakens DNS and web security. Lack of privacy and cookie policies indicates compliance gaps with GDPR and related regulations. No incident response or vulnerability disclosure information is provided, limiting transparency. The site uses HTTPS as implied by URLs but no detailed SSL configuration data is available. Minimal user tracking reduces privacy risks but also limits analytics insights. Overall, the security culture appears basic, with no advanced protections or disclosures.

Recommendations

  1. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  2. Publish comprehensive privacy and cookie policies to improve GDPR compliance and user trust.
  3. Implement standard security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to mitigate common web vulnerabilities.
  4. Establish a vulnerability disclosure policy and provide a security contact email to improve incident response readiness and transparency.
  5. Modernize the website’s technical stack and improve mobile responsiveness and accessibility to enhance user experience and SEO.

Contact details published on the site

Addresses
Legal name
Computer Online AG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Computer Online AG
Description
Flugplatz Administration mit Rechnungswesen/Fakturierung für Motorflug, Segelflug, Charter, Haltergemeinschaften, Flugschulen, Sportclubs sowie Vereine in Echtzeit, Online-Buchungssystem zur Flugzeugplanung, Reservations-Agenda, Flugdatenerfassung, digital Flugreisebuch, technische Mängelverwaltung, SMS-basierte Benachrichtigungen, Datenexport in Finanz- und Rechnungswesen.
Key services
Online Flugzeug Reservationssystem, Flugplatz Administration, Flugdatenerfassung und Flugreisebuch, Technisches Log für Wartung und Mängel, SMS und E-Mail Benachrichtigungen, Datenexport in Comatic Business Software, BAZL Statistik
Content quality
good
Branding
consistent

Technology

Stack
HTML, CSS, JavaScript, jQuery 2.2.4
Platforms
Web Browser, iPad, iPhone
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
basic

Security

Observed score
50/100
Good practices seen
  • Use of HTTPS (implied by URLs)
  • ClientTransferProhibited domain status

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website provides a niche aviation reservation and administration service focused on Swiss market
  2. No privacy or cookie policies found, which is a compliance gap
  3. No visible security headers or advanced security features detected
  4. Contact information is clearly provided with emails and phone numbers
  5. No analytics or tracking scripts detected, indicating minimal user tracking
  6. Website design is functional but basic and not highly modernized
  7. No WAF or blocking mechanisms detected, full content accessible
  8. WHOIS data supports legitimacy and domain age is consistent with business claims
Technical notes

Notes

The website is built using basic web technologies including HTML, CSS, and JavaScript with jQuery 2.2.4. It lacks modern frameworks or CMS platforms, indicating potential technical debt. Performance is moderate with no advanced optimization evident. Mobile support is basic but present. SEO is minimal with meta tags present but no structured data or Open Graph tags. Hosting appears self-managed or via a dedicated ASP model by Computer Online AG. No analytics or tracking scripts are detected, which reduces data collection but also limits marketing insights. The site would benefit from modernization to improve performance, security, and user experience.
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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