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Security report for syner.cz

SYNER, s.r.o. · Real Estate · Czech Republic

Medium risk. 9 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

50/100

Risk levelMedium

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

SYNER, s.r.o. is a prominent Czech construction and engineering company with nearly 35 years of market presence, ranking among the top 10 in the Czech Republic. The company specializes in a broad range of construction projects including administrative, residential, industrial, and infrastructure developments, with a strong focus on sustainability and innovative technologies such as BIM. Their business model integrates multiple divisions and resources to deliver tailored, high-quality solutions to investors and clients. Technically, the website employs modern JavaScript libraries and analytics tools, indicating a moderate to advanced digital maturity. Security posture is solid with HTTPS and CSRF protections, though improvements in security headers and incident response disclosures are recommended. Overall, the website is professional, trustworthy, and compliant with GDPR, though cookie consent mechanisms could be enhanced.

Scanned

NIS2 and GDPR posture

GDPR outside view
10/ 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

9 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

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • 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

  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 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 syner.cz

This scan found 24 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.

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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
42
Security headers
50
Email security
85
DNS health
75
Network security
40
GDPR outside view
10
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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention syner.cz, from OffSeq Breach.

Total records
45
Employees
1
Customers
3
Third parties
41
Weak passwords
22%

Latest record dated 2025-11-13 · 2 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for syner.cz.

Select it in the checkout above.

Masked preview

  • –mail1.syner.cz2025-11-13

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)Monitor on Breach(opens in a new tab)

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

SYNER holds a strong market position as a leading construction firm in the Czech Republic, leveraging innovative technologies and sustainability trends to differentiate itself. Their target customers include investors, developers, and public sector clients requiring complex construction and infrastructure projects. The company benefits from a well-integrated service offering and a modern fleet of machinery, supporting efficient project delivery. Partnerships with entities like CREE and a dedicated career site indicate a robust ecosystem and growth orientation. The company’s longevity and domain age reinforce its credibility and stability in the market.

Security posture

The website demonstrates a baseline security maturity with HTTPS enforced and CSRF tokens implemented. However, the absence of visible security headers such as Content Security Policy, HSTS, and X-Frame-Options suggests room for enhancement. No explicit incident response or vulnerability disclosure policies are present, which could impact readiness for security events. GDPR compliance is indicated by the presence of a privacy policy, but cookie consent mechanisms are lacking. Overall, the security posture is adequate but could be improved to align with best practices and regulatory expectations.

Recommendations

  1. Implement comprehensive security headers (CSP, HSTS, X-Frame-Options) to strengthen browser security.
  2. Add a cookie consent banner to comply fully with GDPR cookie regulations.
  3. Publish explicit security and incident response policies, including contact channels for reporting vulnerabilities.
  4. Enhance accessibility features to improve compliance and user experience for all users.
  5. Regularly audit third-party scripts and analytics tools to minimize privacy risks and ensure compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
SYNER, s.r.o.
Description
SYNER is a leading Czech construction and engineering company operating for nearly 35 years. It ranks among the top 10 largest and most significant entities in the Czech construction market. The company emphasizes innovative technologies and personalized investor approaches, offering tailored solutions and sustainable construction projects. Their portfolio includes administrative and residential complexes, civic amenities, transport and ecological structures, industrial and logistics parks, retail and shopping centers, among others. They utilize BIM methodology and adhere to certifications and standards to ensure quality, schedule adherence, and cost efficiency.
Key services
Construction engineering, Project management, Sustainable building solutions, Infrastructure development, Industrial and logistics construction
Content quality
good
Branding
consistent

Technology

Stack
Google Analytics, Google Tag Manager, Uploadcare widget, Anime.js, ScrollMonitor
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
75/100
Good practices seen
  • HTTPS enabled
  • CSRF token present in meta tag

Analytics and tracking

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

Advertising

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 no blocking or WAF challenges.
  2. Content is professional and relevant to the construction and engineering sector.
  3. No explicit privacy or cookie consent banners detected, though GDPR policy is present.
  4. Social media presence is active with official company accounts.
  5. No direct contact emails or phone numbers found in the main HTML; contact likely via contact page.
  6. Use of modern JavaScript libraries and analytics tools.
  7. No visible security headers in HTML; recommend server-side header review.
  8. No vulnerability disclosure or security.txt found.
  9. WHOIS data supports legitimacy and long-term operation.
Technical notes

Notes

The website uses a modern tech stack including Vue.js (implied), Google Analytics, Google Tag Manager, and Uploadcare for file handling. The site is custom-built without a common CMS, indicating tailored development. Performance is moderate with good mobile optimization and basic accessibility. SEO is basic with proper meta tags but could be improved with structured data and enhanced semantic markup. Hosting appears local to the Czech Republic, consistent with the business location. Technical risks include missing security headers and lack of explicit vulnerability disclosure mechanisms.
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. 50/100Medium32 findingsView report
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