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Security report for monzo.com

Monzo Bank · Finance · United Kingdom

Low risk. 1 critical or high finding in SSL/TLS.

Security score

89/100

Risk levelLow

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

Monzo Bank Limited is a well-established UK digital bank founded in 2015, offering a broad range of personal and business banking services including current accounts, savings, investments, loans, and insurance. The company has positioned itself as a leading challenger bank in the UK with over 12 million customers, leveraging a modern digital platform and strong brand presence. The website reflects a mature digital infrastructure with a responsive design, clear navigation, and comprehensive content tailored to UK residents. Technically, the site uses modern frameworks such as Next.js and React, integrates analytics and marketing tools responsibly, and demonstrates good performance and accessibility standards. Security posture is strong with HTTPS, multiple security headers, and no visible vulnerabilities, although explicit incident response and vulnerability disclosure information is not publicly available. Privacy compliance is well addressed with clear privacy and cookie policies and consent mechanisms. Overall, the domain registration and WHOIS data align well with the business claims, supporting high legitimacy and trustworthiness.

Scanned

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

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

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.

    • 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

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Keep watching monzo.com

This scan found 11 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.

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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
77
Security headers
95
Email security
87
DNS health
90
Network security
100
GDPR outside view
83
Average
89

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 monzo.com, from OffSeq Breach.

Total records
692
Employees
0
Customers
641
Third parties
51
Weak passwords
12%

12 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 monzo.com.

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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

Monzo operates in the competitive UK banking sector as a digital challenger bank, targeting tech-savvy consumers and small businesses seeking modern banking solutions. Its business model focuses on free and premium account offerings, leveraging technology to reduce costs and enhance user experience. Revenue streams include subscription plans, lending products, and partnerships. The company maintains a strong partnership ecosystem with marketing affiliates, payment regulators, and review platforms. Growth indicators include a large customer base and positive independent service quality rankings. Strategic observations highlight Monzo's emphasis on customer-centric features such as early payment, cashback, and bill management, differentiating it from traditional banks.

Security posture

Monzo demonstrates a mature security posture with enforced HTTPS, comprehensive security headers, and secure handling of user data. The website does not expose sensitive information or vulnerable libraries. However, the absence of a public vulnerability disclosure policy or security.txt file and lack of explicit incident response contacts may limit transparency and responsiveness in security incidents. The company is regulated by the FCA and PRA, and FSCS protection is prominently communicated, enhancing customer trust. Compliance with GDPR is evident through privacy policies and cookie consent mechanisms. Overall, Monzo's security practices align with industry standards but could benefit from enhanced public security communication.

Recommendations

  1. Publish a dedicated vulnerability disclosure policy or security.txt file to improve transparency and encourage responsible reporting.
  2. Provide explicit incident response contact channels (e.g., security@ or abuse@ email addresses) on the website.
  3. Regularly update and publicly display security certifications or compliance attestations to reinforce trust.
  4. Enhance privacy policy details with explicit data retention periods and user rights information.
  5. Continue investing in accessibility and mobile optimization to maintain excellent user experience across devices.

Contact details published on the site

Addresses
Legal name
Monzo Bank Limited
Registration number
09446231
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Monzo Bank
Description
Making money work for everyone. Organise, save & invest with a free UK current account, joint account or business account.
Key services
Personal current accounts, Joint accounts, Under 16s and 16-17s accounts, Savings Pots and ISAs, Investments and pensions, Credit cards (Flex), Loans and overdrafts, Insurance
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, JavaScript, CSS, Google Tag Manager, Trustpilot widget, Bing UET
Frameworks
Next.js
Platforms
Web, iOS, Android
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Security headers present
  • No exposed sensitive data detected
  • Secure forms with no visible vulnerabilities

Analytics and tracking

Services
Google Analytics (via GTM), Bing UET
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Microsoft Advertising (Bing UET), Google Ads
Tracking pixels
Bing UET
Marketing tools
Trustpilot widget
Transparency
good

Site quality

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

Key observations

  1. Website is professionally designed and well-structured
  2. Strong brand consistency and trust signals
  3. Comprehensive product and service offerings for personal and business banking
  4. Good mobile optimization and accessibility
  5. Robust security posture with HTTPS and security headers
  6. Privacy and cookie policies are present with consent mechanisms
  7. No exposed sensitive data or obvious vulnerabilities detected
  8. No explicit incident response or vulnerability disclosure page found
  9. WHOIS data matches business claims and shows domain age consistent with company history
Technical notes

Notes

The website is built on a modern technology stack featuring Next.js and React, ensuring server-side rendering and fast performance. Integration with Google Tag Manager, Bing UET, and Trustpilot widgets supports analytics and marketing efforts. The site is well-optimized for mobile devices and accessibility, with proper meta tags and SEO practices. Hosting details are not explicitly disclosed but likely involve cloud infrastructure. No technical debt or outdated libraries were detected in the provided content. Opportunities exist to improve technical transparency around security disclosures and incident handling.
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. 89/100Low20 findingsView report
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