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Security report for caslin.cz

Národní knihovna ČR · Government · Czech Republic

Medium risk. 10 critical or high findings in GDPR outside view, Email security and 2 other checks.

Security score

54/100

Risk levelMedium

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

The website www.caslin.cz serves as the portal for the Union Catalogue of the Czech Republic, a project managed by the National Library of the Czech Republic. It aggregates bibliographic data from cooperating Czech libraries and institutions, offering approximately 7.6 million records including monographs, serials, and articles. The site targets library users, researchers, and public institutions seeking bibliographic information. The business model is a public service initiative, positioning itself as a key national resource in the Czech government and non-profit sector. Technically, the site employs legacy technologies such as jQuery 1.11.3 and integrates Google Analytics and FontAwesome for UI and tracking. The site is moderately optimized for performance and mobile use, with basic accessibility and SEO features. The lack of modern frameworks or CMS indicates a relatively simple technical infrastructure. From a security perspective, the site uses HTTPS for external resources but lacks visible security headers and uses an outdated jQuery version, which could expose it to vulnerabilities. No sensitive data exposure or critical security flaws were detected, but improvements are recommended in updating libraries and implementing security headers. Privacy compliance is minimal, with a privacy statement present but no cookie consent mechanism. Overall, the site is trustworthy and serves a legitimate government function, but the absence of WHOIS data and some technical shortcomings reduce its security and compliance posture. Strategic improvements in security practices and privacy compliance would enhance its risk profile and user trust.

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

10 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

  2. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  3. 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';…

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

Keep watching caslin.cz

This scan found 28 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
62
Security headers
15
Email security
60
DNS health
75
Network security
100
GDPR outside view
10
Average
54

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 caslin.cz, from OffSeq Breach.

Total records
2
Employees
0
Customers
2
Third parties
0
Weak passwords
100%

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 caslin.cz.

Select it in the checkout above.

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

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Technical appendix

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

Business context

Business profile

The CASLIN portal is a government-backed union catalog service aggregating bibliographic data from Czech libraries and institutions. Its competitive advantage lies in its comprehensive coverage and official backing by the National Library of the Czech Republic. The business model is non-commercial, focusing on public service and information accessibility. Revenue streams are likely government-funded. The target customers are primarily researchers, librarians, and public institutions. Growth indicators are not explicit but the large record base suggests maturity. The partnership ecosystem includes Czech libraries and the National Library. Operationally, the site is stable but could benefit from modernization and enhanced digital services.

Security posture

The current security maturity is moderate with basic HTTPS usage and no critical vulnerabilities detected. However, the use of an outdated jQuery version and absence of security headers indicate gaps that could be exploited. There is no evidence of GDPR compliance mechanisms such as cookie consent banners, and no incident response or security policy information is publicly available. Data protection practices appear minimal. The site would benefit from adopting recognized security frameworks and improving transparency around security and privacy. Incident response readiness is unknown, representing a potential risk.

Recommendations

  1. Update all JavaScript libraries, especially jQuery, to the latest secure versions to mitigate known vulnerabilities.
  2. Implement comprehensive security headers including Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), X-Frame-Options, and X-Content-Type-Options.
  3. Add a cookie consent mechanism and enhance privacy compliance to align with GDPR requirements.
  4. Publish clear security and incident response policies to improve transparency and trust.
  5. Conduct regular security audits and penetration testing to identify and remediate vulnerabilities proactively.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Národní knihovna ČR
Description
Souborný elektronický katalog soustřeďující údaje o dokumentech ve fondech spolupracujících českých knihoven a institucí. Obsahuje cca 7,6 milionů záznamů českých a zahraničních monografií, speciálních dokumentů, seriálů a článků. Projekt Národní knihovny ČR.
Key services
Union catalog search for books, magazines, articles, Access to bibliographic data of Czech and foreign documents, Library and institution collaboration platform
Content quality
good
Branding
consistent

Technology

Stack
jQuery 1.11.3, Google Analytics, FontAwesome 5.7.2, CSS stylesheets
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
basic

Security

Observed score
55/100
Good practices seen
  • Use of HTTPS implied by external scripts loaded over HTTPS
  • No visible sensitive data exposure
  • Forms use GET method with external target

Analytics and tracking

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

Advertising

Transparency
basic

Site quality

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

Key observations

  1. Website is a union catalog portal for Czech libraries managed by the National Library of the Czech Republic.
  2. No WHOIS data available, limiting domain registration trust analysis.
  3. No privacy or cookie banners detected, but privacy statement exists.
  4. No contact emails or phone numbers explicitly listed on the main page.
  5. Uses outdated jQuery version which may pose security risks.
  6. No visible security headers detected in provided data.
  7. Website content is accessible and not blocked by WAF or security mechanisms.
  8. No adult or questionable content detected.
  9. External links mostly to trusted domains related to analytics and library services.
Technical notes

Notes

The website uses a simple technology stack with jQuery 1.11.3, FontAwesome, and Google Analytics. It lacks modern frameworks or CMS platforms, indicating a legacy or custom-built solution. Performance is moderate with basic mobile optimization and accessibility. The site loads external resources over HTTPS but does not show evidence of advanced performance optimization or CDN usage. Technical debt is indicated by outdated libraries and missing security headers. Modernization opportunities include upgrading libraries, improving mobile responsiveness, and implementing SEO best practices. Technical risks include potential vulnerabilities from outdated scripts and lack of security hardening.
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. 43/100High33 findingsView report
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