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Security report for lseg.com

LSEG · Finance · United Kingdom

Medium risk. 6 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

64/100

Risk levelMedium

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

LSEG (London Stock Exchange Group) is a leading global financial markets infrastructure and data provider, offering a broad range of services including data analytics, indices via FTSE Russell, trading platforms, clearing, post-trade solutions, and risk intelligence. The company targets financial institutions, asset managers, corporates, and central banks worldwide, positioning itself as a critical enabler of sustainable growth and market stability. The website reflects a mature enterprise with comprehensive content, clear navigation, and strong branding. Technically, the site is built on Adobe Experience Manager CMS, leveraging modern web technologies such as jQuery and Adobe Target for personalization and analytics. It uses Cloudflare DNS and AWS CloudFront CDN for performance and resilience. The site is mobile-optimized, accessible, and SEO-friendly, with fast load times and robust infrastructure. From a security perspective, the site employs HTTPS with strong security headers including HSTS, CSP, and X-Frame-Options. OCSP stapling is enabled and successful. However, a subdomain takeover vulnerability exists on dev.lseg.com pointing to an unclaimed CloudFront distribution, which poses a risk. Certificate Transparency compliance is not met, and HSTS is not fully enabled in SSL info. Privacy and cookie policies are comprehensive and GDPR compliant, with consent mechanisms in place. Overall, the website demonstrates a high level of professionalism, security, and compliance, suitable for a large financial enterprise. The main risk is the subdomain takeover vulnerability, which should be remediated promptly to maintain trust and security posture.

Scanned

This is an earlier scan of lseg.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
25/ 100 · Critical
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

6 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.

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • 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

    • High

      Third-party services without privacy policy

      Detected services: Twitter, LinkedIn, YouTube

      What to do: Document all third-party data sharing in your privacy policy

  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 SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching lseg.com

This scan found 17 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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Full report

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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
72
Security headers
70
Email security
50
DNS health
65
Network security
100
GDPR outside view
25
Average
64

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 lseg.com, from OffSeq Breach.

Total records
861
Employees
102
Customers
301
Third parties
458
Weak passwords
13%

Latest record dated 2026-06-18 · 33 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 lseg.com.

Select it in the checkout above.

Masked preview

  • –sts.lseg.com2026-06-18
  • –sts.lseg.com2026-06-13
  • –sts.lseg.com2026-06-13
  • –sts.lseg.com2026-06-12
  • –sts.lseg.com2026-06-08

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

LSEG operates in the finance sector as an essential entity providing critical market infrastructure and data services globally. Its business model revolves around delivering data analytics, trading platforms, indices, clearing, and post-trade services to a diverse financial audience. The company maintains strategic partnerships with Refinitiv, Microsoft, and Eurasia Group, enhancing its data and analytics capabilities. The website content and structure indicate a large enterprise with a strong market position and a focus on sustainability and innovation. The presence of investor relations, media centre, and corporate governance sections underscores transparency and corporate maturity.

Security posture

The website exhibits a strong security posture with HTTPS enforced, multiple security headers, and OCSP stapling. The content security policy restricts framing to trusted domains, reducing clickjacking risks. Privacy policies and cookie consent mechanisms align with GDPR requirements. However, the detected subdomain takeover vulnerability on dev.lseg.com is a significant security gap that could allow attackers to hijack the subdomain and potentially conduct phishing or malware distribution. The lack of a published security.txt file or explicit incident response contact reduces transparency for vulnerability reporting. Certificate Transparency non-compliance and incomplete HSTS deployment are minor issues that should be addressed to enhance security further.

Recommendations

  1. Immediately remediate the subdomain takeover vulnerability on dev.lseg.com by removing or correctly configuring the CloudFront alias.
  2. Enable full HSTS with preload to strengthen HTTPS enforcement across all subdomains.
  3. Ensure SSL certificates comply with Certificate Transparency requirements to improve trust and detection of fraudulent certificates.
  4. Publish a security.txt file to facilitate responsible vulnerability disclosure and improve incident response readiness.
  5. Regularly audit and update third-party scripts and libraries to mitigate risks from vulnerable components.
Technical notes

Notes

The website is hosted on a robust infrastructure using Cloudflare DNS and AWS CloudFront CDN, ensuring high availability and performance. It uses Adobe Experience Manager as the CMS, integrating Adobe Target for personalization and analytics. The front-end employs jQuery 3.4.1 and modern HTML5 standards with responsive design. Security headers and HTTPS are properly configured, though some improvements are needed in HSTS and certificate transparency. Performance is fast with caching and CDN usage. Accessibility features such as skip navigation links and ARIA roles are implemented, supporting inclusive user experience. SEO is supported by canonical links, meta tags, Open Graph, and Twitter cards. Overall, the technical implementation reflects a mature enterprise-grade website with minor areas for enhancement.
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

Earlier scans of this domain

  1. 64/100Medium22 findingsView report
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