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Security report for on24.com

ON24, Inc. · Technology · United States

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

Security score

75/100

Risk levelMedium

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

ON24, Inc. is a leading AI-powered webinar and engagement platform founded in 1998, targeting B2B marketers and enterprises globally. The company offers a SaaS platform that transforms webinars, virtual events, and digital content into personalized buyer journeys, helping clients drive pipeline and revenue. The website reflects a mature digital presence with excellent content quality, professional design, and comprehensive marketing tools integration. Technically, the site is built on WordPress with modern frameworks and extensive use of analytics and tracking technologies, ensuring good performance and SEO optimization. Security posture is strong with HTTPS, security headers, and no visible vulnerabilities, although explicit security policies and incident response information are not publicly disclosed. Privacy compliance is well addressed with clear privacy and cookie policies and consent mechanisms. The absence of WHOIS data reduces transparency but is offset by strong brand trust signals, including a public NYSE listing and consistent social media presence. Overall, ON24 presents a credible, professional, and secure online presence suitable for its enterprise clientele.

Scanned

This is an earlier scan of on24.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
100/ 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 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

      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 on24.com

This scan found 20 issues across 5 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
57
Security headers
45
Email security
75
DNS health
75
Network security
100
GDPR outside view
100
Average
75

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 on24.com, from OffSeq Breach.

Total records
2,874
Employees
11
Customers
2,720
Third parties
143
Weak passwords
27%

Latest record dated 2026-05-13 · 30 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 on24.com.

Select it in the checkout above.

Masked preview

  • –webmail.on24.com2026-05-13
  • –corp-sso.on24.com2026-05-13
  • –webmail.on24.com2026-05-12
  • –webmail.on24.com2026-01-10
  • –webmail.on24.com2025-07-29

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

ON24 holds a strong market position as a technology provider specializing in AI-driven webinar and digital engagement solutions. Its business model revolves around SaaS offerings that enable enterprises to conduct virtual events and webinars with rich analytics and personalized experiences. The company targets marketing and sales professionals in B2B sectors, leveraging partnerships with major marketing platforms like Marketo and Drift. The extensive content and active blog indicate a focus on thought leadership and customer education. The presence of a NYSE ticker symbol and global support locations underscores its enterprise scale and international reach. The company’s growth is supported by a robust marketing ecosystem and a comprehensive digital strategy.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, multiple security headers (HSTS, CSP, X-Frame-Options, etc.), and no exposed sensitive data in the HTML content. The use of reputable third-party analytics and marketing tools is balanced with privacy compliance measures, including cookie consent and GDPR indicators. However, the absence of a publicly available security policy, incident response plan, or vulnerability disclosure program suggests areas for improvement in transparency and readiness. No critical vulnerabilities or malware indicators were detected. Overall, the security maturity is high but could benefit from enhanced public documentation of security governance.

Recommendations

  1. Publish a dedicated security policy page outlining security governance and controls.
  2. Establish and publicize an incident response and vulnerability disclosure process.
  3. Provide clear contact information for a Data Protection Officer or security team.
  4. Regularly review and audit third-party scripts to mitigate supply chain risks.
  5. Enhance accessibility features to meet or exceed WCAG standards for inclusivity.

Contact details published on the site

Addresses
Legal name
ON24, Inc.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ON24, Inc.
Description
Propel pipeline and revenue with ON24 — an AI-powered platform transforming webinars, events, and content into personalized buyer journeys.
Key services
Webinars, Virtual events, Content engagement, Audience analytics, Personalized buyer journeys
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress CMS, Yoast SEO plugin, Google Fonts, jQuery, Marketo forms, Crazy Egg, Microsoft Clarity, LinkedIn Insight Tag, Google Tag Manager, Bing Ads, Facebook Pixel, Twitter UWT, Weglot translation plugin, Slick Carousel, Pagination.js
Frameworks
WordPress
Platforms
Web
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Use of security headers
  • No exposed sensitive data in HTML
  • Use of secure third-party scripts

Analytics and tracking

Services
Google Analytics, Crazy Egg, Microsoft Clarity, LinkedIn Insight, Marketo Analytics
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Bing Ads, Google Ads, DoubleClick
Tracking pixels
Facebook Pixel, LinkedIn Insight Tag, Twitter UWT, Marketo Munchkin, Crazy Egg, Microsoft Clarity
Marketing tools
Marketo, Drift Chatbot, Bizible, Weglot
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 professional design.
  2. Strong use of modern web technologies and marketing tools.
  3. Comprehensive privacy and cookie policies with consent mechanisms.
  4. No security policy or incident response information publicly available.
  5. WHOIS data is missing, which reduces transparency but is mitigated by other trust signals.
  6. No adult or questionable content detected; content is business and technology focused.
  7. Multiple tracking and analytics tools used, indicating extensive user data collection.
  8. Social media presence is strong and consistent with brand identity.
Technical notes

Notes

The website is powered by WordPress CMS with a modern tech stack including jQuery, Google Fonts, and various marketing and analytics integrations such as Marketo, Drift, Crazy Egg, and Microsoft Clarity. Performance is optimized with preloading of fonts and images, minified CSS, and asynchronous loading of scripts. SEO is well implemented using Yoast SEO plugin and structured data in JSON-LD format. Mobile optimization is excellent, and accessibility is good though could be improved. Hosting provider details are not explicit but inferred to be enterprise-grade. The technical infrastructure supports a fast, responsive, and user-friendly experience suitable for a global enterprise audience.
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. 75/100Medium29 findingsView report
  2. 75/100 +2Medium28 findingsView report
  3. 73/100Medium27 findingsView report
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