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Security report for yes24.com

예스24 · Retail · South Korea

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

Security score

58/100

Risk levelMedium

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

Yes24 is a prominent South Korean e-commerce platform specializing in books, eBooks, music, DVDs, tickets, and gift products. It serves a broad general audience with a comprehensive cultural content offering and maintains a strong market position as a leading online bookstore in Korea. The website is professionally designed with clear navigation and consistent branding, supporting a large-scale retail business model.

Scanned

NIS2 and GDPR posture

GDPR outside view
58/ 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

6 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. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • 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

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

Keep watching yes24.com

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

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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
47
Security headers
15
Email security
55
DNS health
75
Network security
100
GDPR outside view
58
Average
58

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 platform targets Korean consumers interested in literature, music, and entertainment-related products. It leverages multiple subdomains for specialized services such as eBook clubs and ticket sales, indicating a diversified service ecosystem. The presence of extensive advertising and marketing tools suggests a mature revenue model supported by ad networks and affiliate marketing. The business appears well-established with a large user base and comprehensive product categories.

Security posture

The website enforces HTTPS and uses modern tracking and analytics tools including Google Tag Manager, Microsoft Clarity, and Facebook Pixel. However, it lacks visible security headers and explicit privacy or cookie policies with consent mechanisms in the provided content. WHOIS data is not publicly available, likely due to privacy protection, which is common for commercial entities but reduces transparency. No critical vulnerabilities or exposed sensitive data were detected in the HTML content.

Recommendations

  1. Implement and publicly display comprehensive privacy and cookie policies with user consent mechanisms to improve privacy compliance.
  2. Add security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to enhance security posture.
  3. Provide clear contact information including security incident response contacts and consider publishing a security.txt file.
  4. Regularly update and audit third-party JavaScript libraries to mitigate potential vulnerabilities.
  5. Enhance mobile optimization and accessibility features to improve user experience and compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
예스24
Description
YOUR EVERY STORY 문화 콘텐츠 플랫폼, 예스24
Key services
Online bookstore for domestic and foreign books, eBook sales and Crema Club eBook platform, Music CD/LP sales, DVD/Blu-ray sales, Ticket sales for concerts, musicals, and events, Gift and stationery products
Content quality
good
Branding
consistent

Technology

Stack
jQuery 1.12.4, jQuery Migrate 1.4.1, Google Tag Manager, Microsoft Clarity, Facebook Pixel, RTB House, Creative CDN, OverlayScrollbars
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • Use of secure cookies (implied by HTTPS)
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics (via GTM), Microsoft Clarity, Facebook Pixel
Tracking level
extensive
Privacy practices
poor

Advertising

Ad networks
OAS (Open AdStream), RTB House, Creative CDN, Google Ads, Twitter Ads
Tracking pixels
Facebook Pixel, Microsoft Clarity, Google Analytics (via GTM)
Marketing tools
RTB House, Creative CDN
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 rich content and navigation
  2. No WHOIS data available due to registry privacy or blocking
  3. No explicit privacy, cookie, or terms of service pages detected in provided HTML
  4. Multiple advertising and tracking scripts present
  5. No direct contact emails or phone numbers found in HTML
  6. Website uses HTTPS and modern tracking technologies
  7. Content is primarily in Korean language targeting Korean market
  8. No adult or NSFW content detected
  9. Good categorization and product segmentation for e-commerce
  10. No visible security.txt or vulnerability disclosure information
Technical notes

Notes

The website uses a legacy jQuery version (1.12.4) with jQuery Migrate, indicating some technical debt but also broad compatibility. It integrates multiple third-party scripts for advertising, tracking, and analytics. The site is moderately performant with structured navigation and SEO-friendly meta tags. Mobile optimization is basic but functional. Hosting and CMS details are not explicitly identified. The site uses HTTPS consistently, which is a positive security indicator.
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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