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Security report for sainsburys.co.uk

J Sainsbury plc · Retail · United Kingdom

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

Security score

68/100

Risk levelMedium

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

Sainsbury's is a well-established UK retail enterprise offering a broad range of products including groceries, clothing, homewares, financial services, and energy solutions. The company maintains a strong market position with multiple subsidiary brands such as Tu Clothing, Argos, Habitat, and Sainsbury's Bank. Their digital presence is robust, leveraging modern technologies like React and Gatsby, and integrating advanced analytics and consent management tools such as New Relic and OneTrust. The website demonstrates excellent design, accessibility, and performance, providing a seamless user experience across devices. Security measures are solid with HTTPS enforcement and monitoring, although explicit security headers could be more visible. Privacy compliance is comprehensive, with clear policies and active consent mechanisms. Overall, Sainsbury's website reflects a mature digital infrastructure aligned with its enterprise status and market leadership.

Scanned

NIS2 and GDPR posture

GDPR outside view
63/ 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

2 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

  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

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

Keep watching sainsburys.co.uk

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

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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
Security headers
80
Email security
92
DNS health
70
Network security
100
GDPR outside view
63
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

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 sainsburys.co.uk, from OffSeq Breach.

Total records
67,684
Employees
227
Customers
67,112
Third parties
345
Weak passwords
7%

Latest record dated 2026-06-15 · 56 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 sainsburys.co.uk.

Select it in the checkout above.

Masked preview

  • –sts.sainsburys.co.uk2026-06-15
  • –sts.sainsburys.co.uk2026-06-14
  • –sts.sainsburys.co.uk2026-06-06
  • –sts.sainsburys.co.uk2026-06-06
  • –sts.sainsburys.co.uk2026-06-04

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

Open in Breach(opens in a new tab)Monitor on Breach(opens in a new tab)

Technical appendix

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

Business context

Business profile

Sainsbury's operates as a major retail and financial services provider in the UK, targeting a wide consumer base with diverse offerings. Their business model integrates physical stores with a strong online platform, supporting multiple brands and services. The company benefits from strategic partnerships, notably with Nectar for loyalty programs and Smart Charge for energy services. The presence of detailed privacy and cookie policies, alongside active consent management, indicates a commitment to regulatory compliance and customer trust. The website's content and navigation are tailored to enhance customer engagement and promote various product lines and services, reflecting a sophisticated marketing and operational strategy.

Security posture

The website exhibits a strong security posture with mandatory HTTPS usage and integration of security monitoring tools like New Relic. The presence of a comprehensive cookie consent mechanism via OneTrust further supports privacy and security compliance. However, explicit security headers such as Content-Security-Policy, X-Frame-Options, and others are not clearly visible in the HTML content, suggesting potential areas for enhancement. No vulnerabilities or exposed sensitive data were detected in the analyzed content. The absence of a public vulnerability disclosure policy or dedicated incident response contact points indicates opportunities for improving transparency and responsiveness in security management.

Recommendations

  1. Explicitly implement and document security headers such as Content-Security-Policy, X-Frame-Options, and Referrer-Policy to enhance protection against common web attacks.
  2. Establish and publicize a vulnerability disclosure policy to encourage responsible reporting and timely remediation of security issues.
  3. Provide clear incident response contact information, including dedicated security or abuse email addresses, to improve communication and trust.
  4. Regularly audit third-party scripts and integrations to ensure they do not introduce vulnerabilities or privacy risks.
  5. Enhance visibility of data retention policies and user rights related to privacy to strengthen GDPR compliance and user confidence.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
J Sainsbury plc
Description
Sainsbury's is a large UK-based retailer offering groceries, clothing, homewares, electricals, financial services, and more. They emphasize helping everyone eat better and provide various shopping options including online, in-store, and delivery services.
Key services
Groceries, Clothing (Tu), Homewares (Habitat), Financial services (Sainsbury's Bank), Energy services (Sainsbury's Energy), Online shopping and delivery, Click and collect
Content quality
excellent
Branding
consistent

Technology

Stack
React, Gatsby, New Relic, OneTrust, Tealium, Google Tag Manager
Frameworks
React, Gatsby
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • Use of HTTPS
  • Cookie consent with management
  • No exposed sensitive data in HTML
  • Use of security monitoring (New Relic)

Analytics and tracking

Services
New Relic, Google Tag Manager, Tealium
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Tealium
Tracking pixels
New Relic, OneTrust
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 fully accessible with rich content and navigation.
  2. Strong brand presence with multiple subsidiary and partner sites linked.
  3. Comprehensive privacy and cookie policies with active consent mechanism.
  4. Use of modern web technologies and performance optimization.
  5. Security posture is strong with HTTPS and monitoring but could improve header visibility.
  6. No direct contact emails or phone numbers found on the homepage; likely available on help or contact pages.
  7. Social media presence is well integrated with official accounts linked.
  8. Use of OneTrust for cookie management and New Relic for performance monitoring.
Technical notes

Notes

The website is built on a modern React and Gatsby framework, ensuring fast loading times and responsive design. It employs advanced analytics and tag management tools such as New Relic and Tealium, alongside OneTrust for cookie consent management. The technical implementation reflects a high level of digital maturity with attention to performance, accessibility, and SEO optimization. The use of multiple subsidiary and partner domains is well integrated, supporting a cohesive brand ecosystem. Opportunities exist to improve explicit security header implementation and to enhance transparency around data protection and incident response processes.
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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