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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 well-established enterprise technology company founded in 1998, specializing in AI-powered webinar and digital engagement platforms. The company targets B2B marketers and enterprises, offering services that transform webinars, events, and content into personalized buyer journeys. The website demonstrates a high level of digital maturity with a modern WordPress CMS, extensive use of marketing and analytics tools, and excellent SEO and accessibility practices. Security posture is strong with HTTPS enforcement and security headers, though there is room for improvement in publishing explicit security policies and incident response information. The absence of WHOIS data is a notable anomaly but does not significantly detract from the company's legitimacy given its public trading status and professional web presence. Overall, ON24 presents a trustworthy and professional digital front with comprehensive marketing and engagement capabilities.

Scanned

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 21 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.

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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
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 leading position in the webinar and digital engagement market, leveraging AI to enhance buyer journeys and pipeline generation. Its business model is SaaS-based, focusing on enterprise clients in the technology sector. The company maintains a strong partnership ecosystem and uses advanced marketing tools such as Marketo and Drift. The presence of a NYSE ticker symbol and consistent branding across multiple social media platforms underscores its market credibility. Growth indicators include frequent content updates, extensive blog resources, and global support locations. Strategic observations suggest ON24 is focused on expanding digital engagement capabilities and maintaining leadership in B2B marketing technology.

Security posture

The website employs robust security measures including HTTPS, multiple security headers, and secure form integrations. No vulnerabilities or exposed sensitive data were detected in the HTML content. However, the lack of a dedicated security policy or incident response contact limits transparency. Compliance with GDPR is indicated through cookie consent mechanisms and privacy policy content. The security score is high but could be improved by publishing vulnerability disclosure policies and enhancing incident response readiness. Overall, ON24 demonstrates a mature security posture appropriate for an enterprise SaaS provider.

Recommendations

  1. Publish a dedicated security policy page outlining security practices and compliance.
  2. Provide clear incident response contact information to improve transparency and trust.
  3. Implement and publish a vulnerability disclosure or security.txt file to encourage responsible reporting.
  4. Regularly review and update third-party scripts and integrations to mitigate potential vulnerabilities.
  5. Enhance accessibility features to meet or exceed WCAG standards for broader user inclusion.

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
Webinar hosting, Digital engagement, Content personalization, Audience analytics
Content quality
excellent
Branding
consistent

Technology

Stack
WordPress, Yoast SEO, Google Fonts, jQuery, Slick Carousel, Marketo, Drift Chatbot, Crazy Egg, Microsoft Clarity, Google Tag Manager, Bing Ads, Facebook Pixel, LinkedIn Insight Tag, Twitter Universal Website Tag, OneTrust Cookie Consent
Frameworks
Yoast SEO plugin
Platforms
WordPress CMS
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
  • Secure forms with Marketo integration

Analytics and tracking

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

Advertising

Ad networks
Bing Ads, Google Ads, DoubleClick
Tracking pixels
Facebook Pixel, LinkedIn Insight Tag, Twitter Universal Website Tag, Microsoft Clarity, Crazy Egg
Marketing tools
Marketo, Drift Chatbot, OneTrust Cookie Consent
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 SEO and structured data for enhanced search presence.
  3. Extensive use of third-party marketing and analytics tools.
  4. No security or privacy policy pages explicitly labeled as security policy or incident response.
  5. WHOIS data is missing or unavailable, which is unusual for a major enterprise domain.
  6. No signs of adult or unsafe content.
  7. Good mobile optimization and accessibility features.
  8. Multiple social media channels linked and active.
Technical notes

Notes

The website is built on WordPress with a modern tech stack including jQuery, Slick Carousel, and multiple marketing and analytics integrations such as Marketo, Drift, and Crazy Egg. Performance is optimized with preloading of fonts and images, and the site is mobile responsive with good accessibility features. SEO is enhanced through Yoast SEO plugin and structured data (JSON-LD) implementation. Hosting provider details are not explicit but the use of CDN and external resources indicates a distributed infrastructure. Technical risks are minimal, though reliance on multiple third-party scripts requires ongoing security monitoring. Overall, the technical infrastructure supports a high-quality user experience and scalable marketing operations.
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. 75/100Medium28 findingsView report
  2. 75/100 +2Medium28 findingsView report
  3. 73/100Medium27 findingsView report
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