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Security report for twentythree.com

TwentyThree · Technology · N/a

Low risk. 4 critical or high findings in Security headers and SSL/TLS.

Security score

80/100

Risk levelLow

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

TwentyThree is a leading European video marketing platform specializing in providing businesses with comprehensive video software solutions including webinar hosting, video analytics, and video management. The company targets B2B customers seeking to enhance their marketing strategies through video content. The website demonstrates a professional and consistent brand presence with good content quality and user experience. Technically, the site leverages modern technologies such as HubSpot CMS, Tailwind CSS, and AWS Cloudfront for hosting, ensuring fast performance and mobile optimization. Security posture is strong with HTTPS enforcement and appropriate security headers, although explicit security policies and incident response contacts are not publicly disclosed. Privacy compliance is well addressed with comprehensive privacy and cookie policies and consent mechanisms. However, the absence of WHOIS domain registration data introduces some uncertainty regarding domain legitimacy. Overall, the site is trustworthy and well-maintained, but domain registration verification is recommended to fully confirm legitimacy.

Scanned

NIS2 and GDPR posture

GDPR outside view
95/ 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 X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • 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 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
    • High

      SSL Certificate Expires Soon

      SSL certificate expires in 25 days

      What to do: Renew SSL certificate before expiration

      • NIS2 21(2)(h)
      • IR 2024/2690 9.2(c): Implementing Regulation (EU) 2024/2690, Annex point 9.2(c): Cryptography
      • NIST SC-17: NIST SP 800-53 Rev. 5 SC-17: Public Key Infrastructure Certificates

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

Keep watching twentythree.com

This scan found 15 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

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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
52
Security headers
55
Email security
90
DNS health
85
Network security
100
GDPR outside view
95
Average
80

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

The company operates in the technology sector with a focus on video marketing SaaS solutions. It holds a strong market position in Europe and serves business clients aiming to leverage video for marketing and communication. The business model is subscription-based SaaS, with key services including video hosting, analytics, and webinar capabilities. The website indicates a medium-sized enterprise with professional digital infrastructure and marketing tools such as HubSpot and Google Tag Manager. Social media presence on Twitter and Facebook supports brand engagement. The company maintains GDPR compliance and transparent privacy practices, enhancing its credibility in regulated markets.

Security posture

The website exhibits a mature security posture with HTTPS enabled and multiple security headers implemented, reflecting adherence to best practices. The use of a cookie consent tool (LegalMonster) indicates attention to privacy regulations. No vulnerabilities or exposed sensitive data were detected in the HTML content. However, the lack of a published security policy or incident response contact limits transparency in security governance. There is no evidence of a vulnerability disclosure program or security.txt file. The domain WHOIS data is missing, which could be a risk factor for trust and domain ownership verification. Overall, the security posture is good but could be improved by adding explicit security governance documentation and incident response information.

Recommendations

  1. Publish a dedicated security policy page outlining security practices and compliance.
  2. Provide clear incident response contact information, including security@ or abuse@ email addresses.
  3. Implement and publish a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  4. Verify and update WHOIS domain registration information to enhance domain legitimacy and trust.
  5. Continue maintaining strong privacy compliance and consider adding data retention policies for transparency.

Contact details published on the site

Addresses
Legal name
TwentyThree Ltd
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
TwentyThree
Description
TwentyThree is the leading European player in video software. We are the video marketing platform companies upgrade to when they’re ready to Get Real with video.
Key services
Video marketing platform, Webinar hosting, Video analytics, Video hosting and management
Content quality
good
Branding
consistent

Technology

Stack
HubSpot, LegalMonster (cookie consent), Google Tag Manager, Cloudfront CDN, Alpine.js
Frameworks
Tailwind CSS
Platforms
AWS Cloudfront
Performance
fast
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Secure cookie consent mechanism
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Facebook Pixel
Marketing tools
HubSpot
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenge
  2. Professional and consistent branding and content
  3. Strong privacy and cookie policy presence with consent mechanism
  4. No explicit security policy or incident response contact found
  5. WHOIS data missing, raising some concerns about domain registration transparency
Technical notes

Notes

The website is built on a modern technology stack including HubSpot CMS, Tailwind CSS for styling, and Alpine.js for interactivity. Hosting is provided via AWS Cloudfront CDN, ensuring fast content delivery and scalability. Google Tag Manager is used for analytics and marketing tag management. The site is mobile optimized and accessible, with proper meta tags and SEO configurations. Cookie consent is managed by LegalMonster, supporting GDPR compliance. No technical debt or outdated libraries were detected in the provided HTML content. Performance is fast, and the site uses HTTPS with strong security headers. Opportunities exist to enhance technical documentation around security and incident response.
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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