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Security report for zerenholding.com

Zeren Group Investment Holding A.Ş. · Energy · Turkey

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

Security score

70/100

Risk levelMedium

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

Zeren Group Investment Holding A.Ş. is a multinational investment holding company operating across 4 continents and 8 major sectors including energy, manufacturing, shipping, professional services, trading, media, hospitality, and banking. The company positions itself as a reputable group with a strong financial history and entrepreneurial spirit, aiming to create sustainable value globally. The website reflects a mature corporate presence with detailed information about its subsidiaries, sectors, and career opportunities, targeting investors, partners, and potential employees. Technically, the website employs modern JavaScript libraries such as jQuery, Swiper.js, and Google Tag Manager for analytics and user experience enhancements. It features a responsive design with multimedia content and interactive navigation. Cookie consent and privacy compliance mechanisms are well implemented, indicating awareness of GDPR and related regulations. From a security perspective, the site uses HTTPS with good SSL configuration and includes cookie consent banners. However, it lacks explicit security headers and a published security policy or incident response contact. Minor JavaScript warnings exist but do not impact usability. The absence of WHOIS data for the domain is a notable concern for domain legitimacy and transparency. Overall, the website is professional, content-rich, and compliant with privacy norms, but improvements in security posture and domain transparency are recommended to enhance trust and resilience.

Scanned

NIS2 and GDPR posture

GDPR outside view
65/ 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 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

      Third-party services without privacy policy

      Detected services: Google Analytics, Facebook, Twitter, LinkedIn, YouTube, Cloudflare

      What to do: Document all third-party data sharing in your privacy policy

  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 zerenholding.com

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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
65
Security headers
25
Email security
85
DNS health
80
Network security
100
GDPR outside view
65
Average
70

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 zerenholding.com, from OffSeq Breach.

No leaked records found

Breach holds no records for zerenholding.com right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

Monitor on Breach (opens in a new tab)

Brand lookalikes

Add-on

Domains that imitate zerenholding.com and could be used for phishing or spoofed email, tracked in OffSeq Breach.

Tracked
5
Registered
5
Resolving
5
High or critical
0

Last checked 2026-06-19

Masked preview

  • er•••••••••.comMediumomission
  • se••••••••••.comLowreplacement
  • ze•••.renholding.comLowsubdomain

See the full lookalike list

A one-off add-on that lists up to 20 of the highest-risk lookalikes of zerenholding.com with registration, mail-server, certificate and DNS signals.

Select it in the checkout above.

Lookalike data refreshes continuously. Monitoring on Breach alerts you when a variant is registered, gains a mail server or starts serving HTTPS.

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

Zeren Group holds a diversified portfolio across multiple industries, leveraging its investment holding model to operate subsidiaries in energy, manufacturing, shipping, and other sectors. The company demonstrates a broad geographic footprint and a large workforce exceeding 1000 employees. Its business model focuses on sustainable growth and value creation, supported by a network of subsidiaries with dedicated websites. The presence of a career portal and social responsibility projects indicates a focus on human capital and corporate social responsibility. The group’s partnerships and memberships further strengthen its market position. Revenue streams likely derive from operational activities in its sectors and investment returns. The company targets institutional investors, business partners, and skilled professionals, positioning itself as a stable and growing multinational entity.

Security posture

The website exhibits a moderate security maturity level with HTTPS enforced and a cookie consent mechanism that aligns with GDPR requirements. The absence of key security headers such as Content-Security-Policy and X-Frame-Options reduces protection against common web attacks. No incident response or security contact information is published, limiting transparency and readiness for security events. Minor JavaScript errors suggest some technical debt but no critical vulnerabilities are evident from the content. The privacy policy and cookie disclosures are comprehensive, supporting data protection compliance. Overall, the security posture is adequate for a corporate website but would benefit from enhanced headers, documented security policies, and vulnerability disclosure mechanisms to improve resilience and trust.

Recommendations

  1. Implement security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to mitigate common web vulnerabilities.
  2. Publish a formal security policy and provide a dedicated security or abuse contact email to improve incident response transparency.
  3. Fix JavaScript warnings and errors to enhance site robustness and user experience.
  4. Add a vulnerability disclosure policy or security.txt file to encourage responsible reporting of security issues.
  5. Ensure WHOIS information is complete and publicly available to improve domain trustworthiness and transparency.

Contact details published on the site

Addresses
Legal name
Zeren Group Investment Holding A.Ş.
Registration number
KVK
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Zeren Group Investment Holding A.Ş.
Description
A group of reputable companies operating in 4 continents and 8 sectors worldwide, focusing on sustainable value creation with financial history and entrepreneurship.
Key services
Energy distribution, Manufacturing, Shipping, Professional services, Trading, Media, Hospitality, Banking
Content quality
good
Branding
consistent

Technology

Stack
jQuery 3.7.1, Swiper.js, Google Tag Manager, Fancybox, Cerezgo cookie consent
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • Cookie consent banner with opt-in/out
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Transparency
good

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 challenge.
  2. Comprehensive cookie consent and privacy policy present, indicating GDPR awareness.
  3. WHOIS data is missing, which reduces domain trustworthiness.
  4. Website uses modern JavaScript libraries and tracking tools.
  5. Multiple subsidiaries and partner domains linked, showing a large corporate group.
  6. Contact information is clearly provided with email, phone, and physical address.
  7. No explicit security policy or incident response contact found.
  8. Minor JavaScript warnings/errors present but do not affect usability.
  9. No terms of service page detected.
  10. Content is business-focused and safe for general audiences.
Technical notes

Notes

The website uses a modern front-end stack with jQuery 3.7.1, Swiper.js for sliders, Fancybox for media display, and Google Tag Manager for analytics. The site is mobile responsive with a clear navigation structure and multimedia content. Cookie consent is managed via Cerezgo scripts, providing granular user control. Performance is moderate with asynchronous loading of analytics scripts. Minor HTML and JavaScript warnings exist but do not critically affect functionality. No CMS or hosting provider is explicitly identified. SEO meta tags and Open Graph tags are present but some Twitter and OG URLs are empty, which could be improved. Accessibility features are basic but present. Overall, the technical infrastructure supports a professional corporate website with room for optimization in performance and accessibility.
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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