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Security report for tesco.com

Tesco PLC · Retail · United Kingdom

Partial score · DNS & email only

71/100

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

Tesco PLC operates a large-scale retail and e-commerce platform primarily focused on groceries, clothing, recipes, banking, and mobile services. The website serves a broad consumer base in the United Kingdom and selected European countries, positioning itself as a leading supermarket and retail brand with a history dating back to 1919. The site features comprehensive content, clear navigation, and consistent branding, reflecting a mature and professional digital presence. Technically, the site employs modern web technologies including micro frontends, React-based components, and advanced monitoring tools such as New Relic and Google Tag Manager, ensuring robust performance and user experience. Security posture is strong with HTTPS enforcement and cookie consent mechanisms, although explicit security headers and vulnerability disclosure policies are not evident. The absence of WHOIS data is unusual but does not detract from the site's legitimacy given the strong brand presence and structured data. Overall, Tesco.com demonstrates a high level of digital maturity and business credibility.

Scanned

NIS2 and GDPR posture

GDPR outside view
88/ 100 · Low
Checks completed
6of 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

1 finding rated critical or high. Fix these first.

  1. 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

      Unable to retrieve SSL certificate

      Could not establish secure connection to retrieve certificate information

      What to do: Check if the server is accessible and SSL/TLS is properly configured

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Keep watching tesco.com

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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
0
Email security
80
DNS health
85
Network security
100
GDPR outside view
88
Average
71

Not counted

  • Security headers: did not complete in this scan.
  • 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

Tesco maintains a dominant market position in retail and grocery sectors, leveraging a multi-channel business model that integrates physical stores with a sophisticated online platform. The company targets general consumers seeking convenience and value, offering a wide range of products and services including groceries, clothing, banking, and mobile connectivity. Strategic partnerships with Tesco Bank and Tesco Mobile are evident, enhancing service offerings. The website's content and marketing emphasize seasonal promotions, special offers, and community engagement, indicating active customer engagement and growth orientation. The use of advanced analytics and consent management reflects compliance with privacy regulations and a focus on data-driven marketing. Tesco's enterprise scale and long history support its competitive advantage and market trust.

Security posture

The website enforces HTTPS and employs a consent management platform to comply with privacy regulations, indicating a baseline security maturity. Use of New Relic monitoring and other analytics tools suggests active performance and error monitoring. However, the absence of explicit security headers such as Content-Security-Policy and lack of published security policies or incident response contacts indicate areas for improvement. No visible vulnerabilities or exposed sensitive data were detected in the HTML content. The missing WHOIS data is a minor concern but likely due to registry policies rather than malicious intent. Overall, Tesco.com maintains a solid security posture appropriate for a large retail enterprise but could enhance transparency and technical controls.

Recommendations

  1. Implement and publish explicit security headers including Content-Security-Policy and X-Frame-Options to enhance protection against common web attacks.
  2. Publish a dedicated security policy and incident response contact information to improve transparency and trust.
  3. Establish and publicize a vulnerability disclosure program, ideally via a security.txt file, to facilitate responsible reporting.
  4. Regularly audit third-party scripts and dependencies to mitigate risks from vulnerable libraries.
  5. Enhance form input validation and security controls to prevent injection and data leakage risks.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Tesco PLC
Description
Welcome to Tesco online. Discover great value groceries, plus clothing, recipes, bank, and mobile services. Browse on Tesco.com now!
Key services
Online groceries, Clothing, Recipes, Banking services, Mobile services
Content quality
excellent
Branding
consistent

Technology

Stack
React (implied by mfe modules), New Relic Browser monitoring, Google Tag Manager, OpenTelemetry (implied by New Relic), CMP (Consent Management Platform) OtSDKStub, Webpack
Frameworks
Micro Frontends (mfe), New Relic monitoring
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent banner for cookies
  • No exposed sensitive data in HTML

Analytics and tracking

Services
New Relic, Google Analytics (implied via GTM), Foresee, Decibel Insight
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google AdSense
Tracking pixels
New Relic, Foresee, Decibel Insight
Marketing tools
Consent Management Platform OtSDKStub
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and navigation
  2. Strong branding and consistent design
  3. Comprehensive privacy and cookie consent mechanisms
  4. Multiple official contact phone numbers listed in structured data
  5. No visible security or phishing warnings
  6. Use of advanced monitoring and analytics tools
  7. No WHOIS data available, which is unusual for a major domain
Technical notes

Notes

The website is built using a modern micro frontend architecture with React components, supported by Webpack bundling and advanced monitoring via New Relic. The presence of Google Tag Manager and multiple analytics services indicates a mature data collection and marketing infrastructure. Performance optimizations such as preconnect and preload hints are used, contributing to fast load times. Mobile optimization and accessibility features are well implemented, ensuring a broad user reach. The lack of CMS identification suggests a custom or proprietary platform. Hosting details are not explicit but likely enterprise-grade. Overall, the technical infrastructure supports a scalable, performant, and user-friendly e-commerce experience with room for enhanced security controls.
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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