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Security report for previo.app

PREVIO s.r.o. · Hospitality · Czech Republic

Medium risk. 4 critical or high findings in Security headers and SSL/TLS.

Security score

70/100

Risk levelMedium

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

PREVIO s.r.o. operates an online hotel reservation and reception system primarily targeting hospitality businesses such as hotels, pensions, apartments, camps, motels, and chalets. The company offers a SaaS platform that facilitates reservation management, document printing including invoices and guest books, and statistical reporting. The website is professionally designed, consistent in branding, and provides relevant content tailored to its target audience in the Czech Republic. The business appears to be medium-sized and established since 2002, although domain registration details could not be verified due to missing WHOIS data. Technically, the website employs a modern technology stack including Google Tag Manager, Google Analytics, Facebook Pixel, Microsoft Clarity, Smartlook, and Cookiebot for cookie consent management. The site is mobile optimized with good SEO and basic accessibility features. Performance is moderate, with no critical technical issues detected. Security posture is good with HTTPS enforced and reCAPTCHA implemented, but lacks some security headers and published security policies. From a security perspective, the site shows adherence to some best practices such as encrypted connections and consent management, but could improve by publishing privacy and security policies, adding security headers, and providing explicit contact information for incident response. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The absence of WHOIS data reduces domain trustworthiness, but the website content and business presence suggest legitimacy. Overall, the website is professional, secure, and compliant at a basic level, suitable for its business purpose. Strategic improvements in privacy transparency, security headers, and domain registration visibility are recommended to enhance trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
100/ 100 · Low
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. 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';…

  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 Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

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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
15
Email security
55
DNS health
80
Network security
100
GDPR outside view
100
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

Technical appendix

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

Business context

Business profile

PREVIO s.r.o. holds a solid position in the Czech hospitality software market, offering a specialized SaaS solution for hotel and accommodation reservation and reception management. Their competitive advantage lies in a comprehensive system that integrates booking management with document generation and reporting, targeting a broad range of accommodation types. The business model is subscription-based SaaS, focusing on hospitality operators as primary customers. The company demonstrates growth potential through digital marketing and analytics integration, leveraging multiple tracking and user behavior tools. Partnerships or subsidiaries were not identified, indicating a focused operational scope. The website content and technology usage reflect a mature digital presence aligned with industry standards.

Security posture

The security maturity of the website is moderate to good. HTTPS is enforced, and anti-bot measures like Google reCAPTCHA are in place, reducing risk from automated attacks. Cookie consent is managed via Cookiebot, supporting GDPR compliance. However, the absence of key security headers such as Content-Security-Policy, X-Content-Type-Options, and X-Frame-Options represents a gap that could expose the site to certain web-based attacks. No explicit security or incident response policies are published, limiting transparency and preparedness communication. No vulnerabilities or sensitive data leaks were observed in the HTML content. The use of multiple analytics and tracking tools suggests moderate user tracking, which should be balanced with privacy considerations. Overall, the site is secure for typical business use but would benefit from enhanced security controls and policy disclosures.

Recommendations

  1. Implement and publish a comprehensive privacy policy detailing data processing and GDPR compliance.
  2. Add essential security headers (Content-Security-Policy, X-Content-Type-Options, X-Frame-Options) to improve protection against common web attacks.
  3. Publish a security policy and incident response contact information to enhance transparency and readiness.
  4. Verify and publish domain WHOIS information to improve domain trustworthiness and legitimacy perception.
  5. Provide clear company contact details including support emails and phone numbers to improve business credibility and user trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
PREVIO s.r.o.
Description
Hotelový rezervační a recepční systém Previo je internetová aplikace, určená provozovatelům ubytovacích zařízení hotelového typu (hotel, penzion, apartmány, kemp, motel, botel, chaty a chalupy). Nabízí přehlednou správu rezervací a umožňuje tisk dokumentů jako jsou faktury, ubytovací kniha hostů, statistické reporty, atd.
Key services
hotel reservation management, reception system, document printing (invoices, guest books), statistical reporting
Content quality
good
Branding
consistent

Technology

Stack
Google Tag Manager, Google Analytics, Facebook Pixel, Microsoft Clarity, Smartlook, Cookiebot, intl-tel-input, reCAPTCHA
Platforms
web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • reCAPTCHA integration
  • Cookie consent management
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, Microsoft Clarity, Smartlook
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
Facebook Pixel, Microsoft Clarity, Smartlook
Marketing tools
Cookiebot
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 challenge.
  2. WHOIS data is unavailable or privacy protected, limiting domain trust analysis.
  3. Cookie consent is implemented with Cookiebot and complies with GDPR basics.
  4. No explicit privacy policy or terms of service pages found in the provided content.
  5. Multiple analytics and tracking tools are used, including Google Analytics, Facebook Pixel, Microsoft Clarity, and Smartlook.
  6. No direct contact emails or phone numbers found in the HTML content provided.
  7. Website targets hospitality industry operators with a SaaS hotel reservation system.
  8. Security best practices are partially implemented but could be improved with security headers and published policies.
  9. Content is professional, relevant, and safe for general audiences.
Technical notes

Notes

The website uses a modern and diverse set of third-party technologies including Google Tag Manager, Google Analytics, Facebook Pixel, Microsoft Clarity, Smartlook, and Cookiebot for analytics and consent management. The site loads asynchronously many scripts to optimize performance. The HTML is well structured with meta tags for SEO and Open Graph for social sharing. Mobile optimization is good, and the site uses international telephone input libraries for user convenience. No CMS was detected explicitly, suggesting a custom or proprietary platform. Hosting provider details are not evident from the content. Performance is moderate with room for improvement in loading speed and accessibility. The site lacks some advanced accessibility features but meets basic standards. Overall, the technical infrastructure supports a professional and functional user experience.
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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