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Security report for udemy.com

Udemy · Education · N/a

Low risk. 4 critical or high findings in Security headers, SSL/TLS and 1 other check.

Security score

79/100

Risk levelLow

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

Udemy is a leading global online learning marketplace offering over 250,000 courses to more than 80 million students worldwide. The platform targets a broad audience including professionals, students, and lifelong learners, providing courses in programming, marketing, data science, and more. Udemy operates a scalable online marketplace business model, leveraging technology to connect instructors and learners globally. The website demonstrates a mature digital infrastructure using modern frameworks like React and Next.js, optimized for performance and mobile responsiveness. Security posture is strong with HTTPS enforcement and consent management via OneTrust, though explicit security headers and incident response contacts could be improved. Overall, Udemy presents a professional, trustworthy, and well-optimized online presence with comprehensive privacy and cookie policies, supporting its enterprise-scale operations.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
88/ 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

4 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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • 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 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

  3. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • High

      Domain Expires Soon

      Domain expires in 15 days

      What to do: Renew domain registration before expiration

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

Keep watching udemy.com

This scan found 14 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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  • 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
75
Security headers
45
Email security
95
DNS health
70
Network security
100
GDPR outside view
88
Average
79

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

Udemy holds a prominent market position as a top online education platform, capitalizing on the growing demand for flexible, self-paced learning. Its business model centers on a marketplace connecting course creators with learners, generating revenue through course sales and subscriptions. The platform's extensive course catalog and large user base provide competitive advantages. Udemy's partnerships and mobile app presence enhance accessibility and user engagement. The company targets diverse customer segments including individual learners, corporate clients, and educational institutions. Growth indicators include continuous content expansion and technology modernization. Strategic observations highlight the importance of maintaining trust through robust privacy compliance and security enhancements to sustain market leadership.

Security posture

Udemy exhibits a solid security posture with mandatory HTTPS, use of consent management tools, and no visible exposure of sensitive data. Security headers are partially implemented, and no known vulnerabilities or malicious indicators were detected in the analyzed content. However, the absence of a published security policy or incident response contact limits transparency in handling security incidents. Compliance with GDPR is indicated by comprehensive privacy and cookie policies. The platform would benefit from publishing a security.txt file and enhancing security headers such as Content-Security-Policy to mitigate risks further. Overall, Udemy maintains a secure environment appropriate for its scale and industry.

Recommendations

  1. Implement and publish a security.txt file to facilitate vulnerability disclosures and incident reporting.
  2. Enhance HTTP security headers by adding Content-Security-Policy, X-Content-Type-Options, and Referrer-Policy.
  3. Provide explicit security incident response contact information on the website.
  4. Regularly audit third-party scripts and libraries to ensure no vulnerabilities are introduced.
  5. Maintain transparency in data retention policies and update privacy notices accordingly.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Udemy
Description
Udemy is an online learning and teaching marketplace with over 250,000 courses and 80 million students. Learn programming, marketing, data science and more.
Key services
Online courses, Learning marketplace, Mobile app learning
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, FontAwesome, Google Tag Manager, OneTrust Consent Management
Frameworks
Next.js
Platforms
Web, Android app
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent management via OneTrust
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Marketing tools
OneTrust Consent Management
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 metadata.
  2. Strong privacy and cookie policies with consent management.
  3. No direct contact emails or phone numbers found on main page.
  4. No explicit security or incident response pages detected.
  5. Modern tech stack with React and Next.js.
  6. Good SEO and mobile optimization.
  7. No suspicious or malicious indicators found in content or links.
Technical notes

Notes

Udemy's website is built on a modern technology stack featuring React and Next.js, enabling server-side rendering and fast performance. The site uses FontAwesome for icons and integrates Google Tag Manager for analytics. Consent management is handled by OneTrust, reflecting attention to privacy compliance. The site is well-optimized for mobile devices and accessibility, with proper meta tags and SEO practices. No CMS was explicitly detected, suggesting a custom or proprietary platform. Hosting details are not disclosed in the content but the use of CDN domains indicates a distributed content delivery approach. The technical implementation supports a high-quality user experience with fast load times and responsive design, suitable for a large-scale educational platform.
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. 76/100 −5Low21 findingsView report
  2. 81/100Low19 findingsView report
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