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Security report for post.cz

Seznam.cz, a.s. · Media · Czech Republic

Medium risk. 4 critical or high findings in GDPR outside view and SSL/TLS.

Security score

73/100

Risk levelMedium

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

Seznam.cz, a.s. operates a comprehensive Czech internet portal offering a variety of digital services including email, maps, real estate listings, and streaming. The login portal analyzed is a secure gateway to these services, supporting multiple OAuth providers such as Google, Microsoft, Apple, BankID, and MojeID, indicating a mature and user-friendly authentication infrastructure. The website is well-branded and targets general internet users primarily in the Czech Republic and Slovakia. Technically, the site uses modern web technologies with responsive design and password strength indicators, although some accessibility and security header enhancements could be made. Security posture is solid with HTTPS enforced and multi-factor authentication options, but lacks visible security headers and explicit incident response contacts. Privacy compliance is partially addressed with clear privacy and terms of service links, but no cookie consent mechanism is present. Overall, the site is trustworthy and professionally maintained, though improvements in privacy and security transparency are recommended.

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

4 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 Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • 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

  2. 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 post.cz

This scan found 18 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
75
Security headers
80
Email security
70
DNS health
75
Network security
100
GDPR outside view
40
Average
73

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

Seznam.cz holds a leading position in the Czech digital media market, providing essential online services to a large user base. Its business model revolves around offering free and premium digital services supported by advertising and partnerships. The integration of multiple third-party identity providers enhances user convenience and security. The company demonstrates consistent branding and a broad service ecosystem, including email, maps, and real estate platforms. While direct contact information is not exposed on the login page, the presence of comprehensive privacy policies and terms of service reflects regulatory compliance and corporate governance. The lack of WHOIS data publicly available suggests privacy protection measures, common for large enterprises. Strategic partnerships with identity providers like BankID and MojeID indicate a robust authentication ecosystem.

Security posture

The website enforces HTTPS and supports multiple secure authentication methods, including OAuth and two-factor authentication, which are strong security indicators. Password strength meters and SMS verification codes further enhance account security. However, the absence of visible security headers such as Content-Security-Policy and X-Frame-Options is a notable gap that could expose the site to certain web-based attacks. No direct incident response or vulnerability disclosure information is provided, which could hinder rapid response to security incidents. The site does not display cookie consent banners, which may affect GDPR compliance. Overall, the security posture is good but could be improved by implementing recommended headers, enhancing privacy notices, and providing clear security contact channels.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to mitigate common web vulnerabilities.
  2. Add a cookie consent mechanism to comply fully with GDPR and enhance user privacy transparency.
  3. Publish explicit incident response and vulnerability disclosure contact information to improve security readiness and trust.
  4. Enhance accessibility features to meet modern standards and improve user experience for all users.
  5. Regularly audit third-party scripts and OAuth integrations to ensure no vulnerabilities or data leakage.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Seznam.cz, a.s.
Description
Přihlášením do jednoho účtu můžete používat vše od Seznamu. Email, Mapy, Sreality, Stream, firemní profil Seznam naplno a mnohem víc.
Key services
Email, Maps, Real Estate Listings, Streaming, Business Profiles
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, CSS, HTML5, OAuth 2.0, OpenID Connect
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • OAuth integration with major providers
  • Password strength indicators
  • Two-factor authentication support

Analytics and tracking

Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
h.seznam.cz
Transparency
basic

Site quality

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

Key observations

  1. Website is a login portal for Seznam.cz email and related services.
  2. Supports multiple OAuth providers including Google, Microsoft, Apple, BankID, MojeID.
  3. No WHOIS data available publicly, possibly due to privacy protection or registry restrictions.
  4. Privacy policy and terms of service are clearly linked and available.
  5. No direct company contact emails or phone numbers found on the login page.
  6. No cookie consent banner detected despite GDPR relevance.
  7. Site uses HTTPS and modern JavaScript for login functionality.
  8. No signs of adult or unsafe content.
  9. No visible security headers detected in provided data.
  10. No explicit incident response or vulnerability disclosure information found.
Technical notes

Notes

The site uses modern HTML5, CSS, and JavaScript technologies with OAuth 2.0 integration for authentication. It supports multiple identity providers, indicating a flexible and scalable authentication infrastructure. The presence of password strength indicators and multi-factor authentication options shows attention to security best practices. Performance appears moderate with no explicit indicators of slow loading. Mobile optimization is good, and the site is responsive. However, no CMS or hosting provider information is evident from the content. SEO optimization is basic with meta description present but no Open Graph or JSON-LD structured data detected. Accessibility is basic and could be improved. Overall, the technical implementation is solid but has room for enhancements in security headers and privacy compliance.
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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