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Security report for groupon.de

Groupon · E-commerce · Germany

Low risk. 2 critical or high findings in Security headers and SSL/TLS.

Security score

79/100

Risk levelLow

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

Groupon.de is a major e-commerce platform specializing in local deals, coupons, and online shopping offers targeted at consumers in Germany. The website presents a professional and well-structured interface with a broad range of services including local experiences, goods, and travel bookings. The platform leverages modern web technologies and integrates fraud prevention services such as Signifyd and Riskified to secure transactions. Privacy and cookie policies are comprehensive and GDPR compliant, reflecting a mature approach to data protection. The site is well optimized for performance and accessibility, providing a positive user experience across devices.

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

2 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 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

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

Keep watching groupon.de

This scan found 18 issues across 5 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
62
Security headers
45
Email security
97
DNS health
70
Network security
100
GDPR outside view
100
Average
79

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 groupon.de, from OffSeq Breach.

Total records
18,103
Employees
0
Customers
18,046
Third parties
57
Weak passwords
14%

19 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 groupon.de.

Select it in the checkout above.

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

Technical appendix

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

Business context

Business profile

Groupon operates as a leading online marketplace for discounted deals and coupons, targeting a broad consumer base in Germany. Its business model revolves around aggregating offers from local merchants and service providers, generating revenue through commissions and advertising. The company maintains a strong international presence with multiple regional domains. The platform's integration with major fraud prevention and analytics tools indicates a focus on secure and data-driven operations. While direct contact information is limited on the homepage, the presence of user account management and support links suggests established customer service channels. The brand is consistent and trusted, supported by extensive user reviews and ratings.

Security posture

The website demonstrates a robust security posture with enforced HTTPS, comprehensive security headers, and the use of advanced bot and fraud prevention mechanisms including Google reCAPTCHA, Signifyd, and Riskified. Error handling scripts filter sensitive information, reducing exposure risks. However, explicit security policies and incident response contacts are not publicly visible, which could be improved to enhance transparency and trust. No vulnerabilities or exposed sensitive data were detected in the analysis. Overall, the security implementation aligns with industry best practices for e-commerce platforms.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency.
  2. Implement and publicize a vulnerability disclosure program or security.txt file.
  3. Provide clear security contact emails for reporting incidents or abuse.
  4. Regularly review and update third-party scripts to mitigate potential vulnerabilities.
  5. Enhance data retention disclosures to comply fully with privacy regulations.

Contact details published on the site

Addresses
Legal name
Groupon, Inc.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Groupon
Description
Entdecke und spare mit über 300.000 der besten Angebote und Dinge, die Du in deiner Nähe tun kannst. Online einkaufen ist einfach - kaufe jetzt Gutscheinangebote und löse deinen Rabatt sofort online oder persönlich mit unserer App ein.
Key services
Local deals, Coupons, Online shopping, Booking services, Mobile app
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, React/Preact, Google reCAPTCHA, Google Tag Manager, Signifyd fraud prevention, Riskified fraud beacon, Boomerang performance monitoring, Hogan.js, Underscore.js, Modernizr
Frameworks
React/Preact
Platforms
Web desktop, Mobile app (iOS and Android)
Performance
fast
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of reCAPTCHA for bot prevention
  • Fraud prevention via Signifyd and Riskified
  • Secure cookie usage
  • Error filtering and logging with filtering of sensitive info

Analytics and tracking

Services
Google Analytics, Optimize Suite
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google Ad Manager
Tracking pixels
Riskified, Signifyd
Marketing tools
Optimize Suite
Transparency
good

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 no blocking.
  2. Strong use of modern web technologies and performance optimizations.
  3. Comprehensive privacy and cookie policies present and GDPR compliant.
  4. No direct contact emails or phone numbers found on main page; likely available on dedicated support pages.
  5. Security practices include HTTPS, reCAPTCHA, and fraud prevention services.
  6. No explicit security policy or incident response info publicly visible.
  7. Advertising and analytics use industry-standard tools with moderate tracking.
  8. Content is safe for general audiences with no adult or questionable material.
  9. WHOIS data consistent with legitimate business operations.
Technical notes

Notes

The website is built on a modern JavaScript stack utilizing React/Preact frameworks, supported by robust CDN infrastructure via Akamai. It employs advanced performance monitoring tools like Boomerang and integrates Google Tag Manager for analytics and marketing. The site is optimized for fast loading and mobile responsiveness, with accessibility considerations evident in ARIA labels and keyboard navigation support. The use of multiple preloaded fonts and scripts indicates attention to user experience. Hosting on Akamai ensures scalability and reliability. Technical debt appears minimal, though continuous monitoring of third-party dependencies is advised to maintain 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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