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Security report for lianjia.com

贝壳找房（北京）科技有限公司 · Real Estate · China

Medium risk. 5 critical or high findings in Security headers and GDPR outside view.

Security score

68/100

Risk levelMedium

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

The website bj.lianjia.com is a major real estate platform serving Beijing and other Chinese cities, operated by 贝壳找房（北京）科技有限公司. It offers comprehensive services including second-hand housing sales, new home listings, rentals, and real estate market information. The platform is well-established with a large inventory and user engagement features such as login, search suggestions, and mobile app integration. Technically, the site uses modern JavaScript frameworks and analytics tools, with good mobile optimization and SEO practices. Security posture is solid with HTTPS and captcha protections, though explicit security headers are not fully implemented. Privacy policies and terms of service are clearly presented, but cookie consent mechanisms are absent. WHOIS data is unavailable, which slightly impacts transparency but the site shows strong trust signals including official licenses and contact information.

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

5 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 lianjia.com

This scan found 21 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

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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
90
Security headers
15
Email security
70
DNS health
75
Network security
100
GDPR outside view
58
Average
68

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

Lianjia operates as a leading real estate brokerage and listing platform in China, with a strong market position in Beijing. Its business model revolves around providing property listings, facilitating transactions, and offering value-added services such as price inquiries and real estate knowledge bases. The company targets general consumers looking to buy, sell, or rent properties. The presence of multiple city-specific subdomains indicates a broad geographic footprint. The platform leverages partnerships, such as with bj.ke.com, to enhance its service ecosystem. The website content and structure reflect a mature digital presence aimed at maximizing user engagement and conversion.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, captcha integration on authentication forms, and no visible exposure of sensitive data. However, the absence of explicit security headers like Content-Security-Policy and X-Frame-Options is a gap that could be exploited. The site uses multiple third-party scripts for analytics and user tracking, which should be regularly audited for vulnerabilities. Incident response contacts are provided, indicating readiness to handle abuse reports. Privacy compliance is partial, lacking cookie consent banners and explicit GDPR compliance indicators. Overall, the security measures are adequate for the business type but could be enhanced to meet higher standards.

Recommendations

  1. Implement explicit security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to strengthen browser security.
  2. Add a cookie consent banner and mechanism to comply with privacy regulations and improve user transparency.
  3. Conduct regular security audits of third-party scripts and dependencies to mitigate vulnerabilities.
  4. Enhance accessibility features to improve compliance and user experience for all users.
  5. Improve WHOIS transparency or provide domain registration details on the website to increase trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
贝壳找房（北京）科技有限公司
Description
北京链家网是提供北京二手房买卖、北京新房、北京租房、北京房价查询等业务的专业房产网站，可为您买卖北京二手房提供帮助,链家网北京站同时具有北京二手房、北京租房及购房问答和百科等频道,还可以在线查询北京二手房价格.买房卖房上北京链家网,让房产交易不再难.
Key services
Second-hand housing sales, New housing sales, Rental housing, Real estate price inquiry, Real estate knowledge and Q&A
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, jQuery, RequireJS, Baidu Analytics, LianjiaIM SDK, Captcha SDK, HTML5, CSS3
Frameworks
RequireJS
Platforms
Web (PC and mobile), iOS app, Android app
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Captcha integration on login and registration
  • User tracking with consent implied
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Baidu Analytics, CNZZ Analytics
Tracking level
extensive
Privacy practices
basic

Advertising

Tracking pixels
Baidu Analytics, CNZZ Analytics
Marketing tools
User behavior tracking scripts, Search suggestion and autocomplete
Transparency
basic

Site quality

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

Key observations

  1. Website is a comprehensive real estate platform focused on Beijing and other Chinese cities.
  2. Content is rich with property listings, search features, and user account management.
  3. Strong integration of analytics and user tracking for marketing and UX improvement.
  4. Security measures include HTTPS and captcha on login forms but lack explicit security headers.
  5. Privacy policy and terms of service are clearly linked and comprehensive.
  6. Contact information includes official phone numbers and abuse reporting emails.
  7. No adult or questionable content detected; suitable for general audience.
  8. WHOIS data is missing, which reduces transparency but does not negate legitimacy.
  9. Website is well-structured with good SEO and mobile optimization.
Technical notes

Notes

The website employs a modern JavaScript-based front-end architecture using RequireJS and jQuery, supported by Baidu and CNZZ analytics for user behavior tracking. It integrates captcha services for bot mitigation and uses a proprietary IM SDK for user communication. The site is optimized for both desktop and mobile platforms, with responsive design elements and app download links. Performance is moderate, with asynchronous loading of scripts and lazy loading of images. SEO is well addressed with canonical tags, meta descriptions, and structured navigation. However, there is room for improvement in accessibility and explicit security header implementation to reduce technical risks.
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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