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Security report for groupon.co.uk

Groupon · Retail · United Kingdom

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

Security score

73/100

Risk levelMedium

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

Groupon UK operates as a prominent online marketplace offering local deals and discounts across restaurants, shopping, events, and travel. The website targets a broad general audience seeking savings on various activities and products. The business model centers on aggregating and promoting discounted offers to consumers, positioning itself as a leading player in the retail and e-commerce sectors within the UK market. The site branding and content quality are consistent and professional, supporting a large-scale enterprise presence.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 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.co.uk

This scan found 24 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

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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
54
Security headers
45
Email security
85
DNS health
70
Network security
100
GDPR outside view
83
Average
73

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

Groupon's market position as a major deal aggregator provides competitive advantages through extensive partnerships with local businesses and a wide consumer base. Revenue streams likely derive from commissions on deals sold and advertising. The platform appeals to cost-conscious consumers and leverages mobile app distribution to enhance reach. While no explicit parent or subsidiary companies are identified in the provided data, Groupon is known globally as a significant e-commerce entity. The absence of detailed business registration data limits deeper corporate insights.

Security posture

The website employs HTTPS, ensuring encrypted communications, but lacks visible advanced security headers such as Content-Security-Policy or X-Frame-Options in the provided data. No critical vulnerabilities or exposed sensitive data were detected. Privacy compliance indicators such as privacy and cookie policies are not found, suggesting potential gaps in regulatory adherence. Incident response and vulnerability disclosure mechanisms are not evident, which could impact security readiness. Overall, the security posture is moderate but could benefit from enhanced policies and technical controls.

Recommendations

  1. Implement and publicly link comprehensive privacy and cookie policies to improve GDPR compliance and user trust.
  2. Add and configure security headers like Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to strengthen defense against common web attacks.
  3. Establish and publish a vulnerability disclosure policy or security.txt file to facilitate responsible reporting of security issues.
  4. Enhance accessibility features to meet recognized standards and improve user experience for all visitors.
  5. Conduct regular audits of third-party scripts and dependencies to mitigate risks from vulnerable libraries.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Groupon
Description
Save up to 70% on 1,000s of local restaurants, shopping, events & more. Find great deals on the best activities & things to do. Download the Groupon App today.
Key services
Local restaurant deals, Shopping discounts, Event tickets, Travel deals, Gift cards
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, React, Tailwind CSS, Next.js, CDN usage
Frameworks
React, Next.js
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
65/100
Good practices seen
  • HTTPS enabled

Analytics and tracking

Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
OneTrust
Transparency
basic

Site quality

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

Key observations

  1. Website content is fully accessible and not blocked by WAF or security challenges.
  2. WHOIS data is unavailable due to domain naming rules violation error from Nominet UK.
  3. Website uses modern frontend technologies and CDN for assets.
  4. No explicit contact emails or phone numbers found in the provided HTML snippet.
  5. Privacy, cookie, and terms of service pages or links are not detected in the provided content.
  6. No security.txt or vulnerability disclosure information found.
  7. Site is HTTPS enabled but lacks visible security headers in provided data.
  8. Content is safe for general audiences with no adult or explicit content.
  9. Social media links and company contact details are not explicitly found in the provided HTML snippet.
Technical notes

Notes

The website utilizes a modern technology stack including React and Next.js frameworks, supported by Tailwind CSS for styling and CDN services for asset delivery. The site demonstrates good mobile optimization and SEO practices with appropriate meta tags and Open Graph data. Performance is moderate, with room for improvement in loading speed and accessibility compliance. The absence of a detected CMS suggests a custom or headless architecture. Technical risks include potential exposure from third-party scripts and missing security headers.
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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