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Security report for o2.sk

O2 Slovensko · Telecommunications · Slovakia

Medium risk. 6 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

66/100

Risk levelMedium

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

O2 Slovensko operates as a major telecommunications provider in Slovakia, offering mobile telephony, internet services, voice plans, and device sales through its e-shop and customer portal. The website reflects a mature digital presence with a professional design, consistent branding, and a focus on Slovak consumers. Technically, the site leverages modern frameworks such as Liferay CMS, Bootstrap, and integrates multiple analytics and marketing tools including Google Tag Manager and Luigisbox. Security posture is solid with HTTPS enforcement and standard security headers, though explicit privacy and terms of service documents are not directly found in the provided content. Overall, the site is trustworthy and well-positioned in its market segment.

Scanned

NIS2 and GDPR posture

GDPR outside view
40/ 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

6 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

      Third-party services without privacy policy

      Detected services: Google Analytics, Facebook, Twitter, YouTube, Google APIs, Google Ads

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

  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 o2.sk

This scan found 22 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
67
Security headers
50
Email security
70
DNS health
70
Network security
100
GDPR outside view
40
Average
66

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

The company targets Slovak consumers and businesses seeking telecommunications services, positioning itself as a fair and reliable operator. Its business model combines service provision with retail sales of devices and data packages. The presence of a customer self-service portal (Moje O2) indicates a focus on customer empowerment and digital engagement. The integration of multiple third-party marketing and analytics services suggests active customer behavior tracking and marketing optimization. The lack of visible contact details in the HTML may indicate these are located elsewhere or require user login. The company appears to maintain consistent branding and a strong market presence in Slovakia.

Security posture

The website demonstrates a good security baseline with HTTPS, security headers, and no visible sensitive data exposure. However, the absence of explicit security policies, incident response contacts, or vulnerability disclosure mechanisms limits transparency and may impact user trust. The use of multiple third-party scripts necessitates ongoing security audits to mitigate risks from external dependencies. GDPR compliance is partially indicated by cookie consent mechanisms but lacks visible comprehensive privacy documentation. Overall, the security posture is adequate but could be improved with clearer policy disclosures and incident response information.

Recommendations

  1. Publish clear and accessible privacy and cookie policies with direct URLs on the website.
  2. Provide explicit terms of service and user agreements to enhance legal clarity.
  3. Include visible and verified contact information including security incident response contacts.
  4. Implement and publicize a vulnerability disclosure policy or security.txt file.
  5. Enhance accessibility features to meet compliance standards and improve user experience.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
O2 Slovensko
Description
Férový operátor O2 Slovensko. Ponúka výhodné volania, dátové balíčky, mobilné telefóny a tablety v e-shope. Poskytuje služby ako kontrola spotreby, faktúry, dobíjanie kreditu a aktivácia balíčkov v zóne Moje O2.
Key services
Mobile telephony, Internet services, Voice calling plans, Mobile devices sales, Customer self-service portal (Moje O2)
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, jQuery 2.2.4, Bootstrap 3.4.1, Swiper 5.4.5, Fancybox 2.1.7, Luigisbox LBX-816, Google Tag Manager, Google Web Vitals, Liferay Portal
Frameworks
Liferay, Bootstrap
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Use of security headers
  • No visible exposed sensitive data

Analytics and tracking

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

Advertising

Ad networks
Google DoubleClick
Marketing tools
Luigisbox
Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed and well-branded for a major Slovak telecom operator.
  2. Content is primarily in Slovak language targeting local consumers.
  3. No explicit privacy or terms of service pages found in the provided HTML content.
  4. Cookie consent mechanism is implemented indicating GDPR awareness.
  5. Multiple third-party analytics and marketing scripts are used.
  6. No contact emails or phone numbers explicitly found in the HTML snippet provided.
  7. No visible security.txt or vulnerability disclosure policy.
  8. Uses modern web technologies and frameworks including Liferay CMS and Bootstrap.
  9. No signs of WAF or content blocking detected.
Technical notes

Notes

The website is built on a robust technical foundation using Liferay CMS and Bootstrap for responsive design. It incorporates modern JavaScript libraries and frameworks, including jQuery and Swiper, to enhance interactivity. Performance appears moderate with deferred script loading and CDN usage for static assets. The site is mobile-optimized and SEO-friendly with appropriate meta tags and Open Graph data. However, there is room for improvement in accessibility and explicit documentation of privacy and security policies. The technical stack is well-maintained but requires continuous monitoring of third-party dependencies for vulnerabilities.
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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