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Security report for blocket.se

Blocket · E-commerce · Sweden

Medium risk. 5 critical or high findings in GDPR outside view, SSL/TLS and 2 other checks.

Security score

65/100

Risk levelMedium

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

Blocket is Sweden's largest online marketplace for classified ads, offering a wide range of categories including vehicles, real estate, furniture, electronics, and clothing. It serves both private individuals and businesses, providing a platform to buy and sell used goods efficiently. The website is part of Vend AB, a reputable parent company, ensuring a strong market presence and trust. The platform offers additional services such as shipping with buyer protection and valuation tools, enhancing user experience and security. Technically, Blocket employs a modern web stack including React and Next.js, supported by robust advertising and analytics integrations like Google Tag Manager, DoubleClick, and Xandr. The site is well-optimized for performance and mobile responsiveness, with good accessibility and SEO practices. Contentful is used as the CMS, and hosting appears to be on a scalable cloud platform, likely AWS. From a security perspective, the website uses HTTPS with strong SSL configurations and implements essential security headers. It integrates modern authentication methods such as BankID and maintains GDPR compliance through a comprehensive privacy and cookie policy managed by Vend. No critical vulnerabilities or exposed sensitive data were detected, indicating a mature security posture. Overall, Blocket presents a low-risk profile with a high level of professionalism, technical maturity, and compliance. Strategic recommendations include enhancing incident response visibility, maintaining third-party script audits, and considering a public vulnerability disclosure policy to further strengthen trust and security.

Scanned

NIS2 and GDPR posture

GDPR outside view
60/ 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. GDPR outside view

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

    • Critical

      No HTTPS encryption

      GDPR requires appropriate security measures for personal data

      What to do: Implement SSL/TLS certificate for HTTPS

    • 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.

    • Critical

      No HTTPS Encryption

      Website does not use HTTPS encryption, making all data transmission vulnerable to interception

      What to do: Implement SSL/TLS certificate and redirect all HTTP traffic to HTTPS

  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 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';…

  4. 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.

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

Keep watching blocket.se

This scan found 13 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

Email alerts on material changes and an exportable JSON history of every change.

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Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
0
Security headers
65
Email security
72
DNS health
90
Network security
100
GDPR outside view
60
Average
65

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

Blocket holds a dominant position in the Swedish e-commerce market for classified ads, leveraging its extensive category and location filters to cater to a broad audience. Its business model revolves around facilitating peer-to-peer and business-to-consumer transactions, supplemented by value-added services like shipping and ad promotion. The parent company, Vend AB, supports its operations, providing stability and strategic direction. The platform's integration with BankID enhances user verification, fostering trust. Growth indicators include a large user base and continuous feature enhancements. Partnerships with advertising networks and analytics providers enable effective monetization and user insights.

Security posture

Blocket demonstrates a strong security posture with mandatory HTTPS enforcement, comprehensive security headers, and no visible vulnerabilities in the analyzed content. The use of BankID for authentication and a robust consent management platform aligns with GDPR requirements. However, explicit security policies and incident response contacts are not prominently displayed, which could be improved. The platform's reliance on multiple third-party scripts necessitates ongoing security audits to mitigate supply chain risks. Overall, the site maintains good data protection practices and secure form handling, contributing to a trustworthy user environment.

Recommendations

  1. Publish a dedicated security policy and incident response contact information to enhance transparency.
  2. Implement and publicize a security.txt file for vulnerability disclosure to encourage responsible reporting.
  3. Regularly audit and update third-party scripts and dependencies to prevent supply chain vulnerabilities.
  4. Enhance user education on privacy and security features to build stronger trust.
  5. Develop a long-term security strategy focusing on continuous compliance and proactive threat management.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Blocket
Description
Hela Sveriges marknadsplats med över 5 miljoner varor - hitta fynd & sälj snabbt på Blocket.se
Key services
Classified ads for vehicles, real estate, furniture, electronics, clothing, and more, Additional services like shipping with buyer protection, ad promotion, and valuation tools
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, Google Tag Manager, Google DoubleClick (GPT), Schibsted Inventory Ad Takeover, Relevant Digital, Xandr (AppNexus), CMP (Consent Management Platform) by M10s, Vend platform
Frameworks
React, Next.js
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • Use of HTTPS with valid certificates
  • Content Security Policy implemented
  • Use of modern authentication (BankID)
  • Consent management for GDPR compliance

Analytics and tracking

Services
Google Analytics, Google Tag Manager, Relevant Digital
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Google DoubleClick, Xandr (AppNexus), Schibsted Inventory
Tracking pixels
Relevant Digital, AppNexus
Marketing tools
Tealium
Transparency
good

Site quality

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

Key observations

  1. Website is a large, professional Swedish marketplace for classified ads.
  2. Strong focus on vehicles, real estate, and general goods.
  3. Comprehensive category and location filters for user convenience.
  4. Use of modern web technologies and frameworks.
  5. Good privacy and cookie compliance with consent management.
  6. No visible security or privacy red flags.
  7. Extensive use of third-party ad and tracking services.
  8. No direct company contact emails or phone numbers found in HTML.
  9. Contact via Zendesk support portal.
  10. No explicit security policy or incident response contact found.
Technical notes

Notes

The website is built on a modern React and Next.js framework, ensuring efficient server-side rendering and client-side interactivity. It uses Contentful as a CMS, enabling flexible content management. The integration of multiple advertising and analytics services indicates a mature digital marketing infrastructure. Performance optimizations and mobile responsiveness are evident, contributing to a positive user experience. The technical stack is well-maintained with no apparent technical debt or outdated components. Opportunities exist to further enhance accessibility and streamline third-party integrations for improved security and performance.
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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