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Security report for cal.com

Cal.com · Technology · N/a

Low risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

76/100

Risk levelLow

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

Cal.com is a technology company providing an open scheduling infrastructure platform designed for individuals, businesses, and developers. The platform offers fully customizable scheduling software that facilitates user-to-user meetings and call scheduling. The website presents a professional and modern design built using Framer, hosted with Cloudflare DNS services, indicating a moderate level of digital maturity. The domain is well-established, registered since 1997, and shows consistent registration data, supporting the company's credibility. Security posture is adequate with HTTPS enabled and domain status protections, but lacks DNSSEC and security headers, which are recommended for enhanced security. Privacy and cookie policies are absent, which is a compliance gap. Overall, the website is safe, business-focused, and trustworthy, but could improve in privacy compliance and security best practices.

Scanned

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

NIS2 and GDPR posture

GDPR outside view
65/ 100 · Medium
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

5 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. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  3. 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

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

Keep watching cal.com

This scan found 16 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

€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

Email alerts on material changes and an exportable JSON history of every change.

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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
40
Email security
87
DNS health
90
Network security
100
GDPR outside view
65
Average
76

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

Cal.com operates in the SaaS scheduling software market, targeting a broad audience including individuals, businesses, and developers. Its open scheduling infrastructure positions it as a flexible alternative in the scheduling software space. The business model revolves around providing customizable scheduling solutions and platform development tools. The company benefits from a long domain history, suggesting stability and market presence. However, the lack of visible contact information and privacy policies on the website may limit user trust and regulatory compliance. The company appears to be medium-sized with a focus on technology sector innovation. No parent or subsidiary companies are identified from the data. The website content is relevant and professionally presented, supporting a positive market position.

Security posture

The website employs HTTPS and has domain status protections that prevent unauthorized domain modifications, indicating a good baseline security posture. However, the absence of DNSSEC leaves the domain vulnerable to DNS spoofing attacks. No security headers such as Content-Security-Policy or X-Frame-Options were detected, which are important for mitigating common web vulnerabilities. There is no published security policy or incident response contact information, which limits transparency and preparedness for security incidents. No vulnerability disclosure or security.txt files were found, reducing the opportunity for responsible vulnerability reporting. Overall, the security posture is moderate but could be significantly improved by implementing recommended security headers, enabling DNSSEC, and publishing security policies.

Recommendations

  1. Enable DNSSEC to protect against DNS spoofing and improve domain security.
  2. Implement standard security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  3. Publish comprehensive privacy and cookie policies with clear GDPR compliance and consent mechanisms.
  4. Add visible and verified contact information including security incident contacts and data protection officer details.
  5. Establish a vulnerability disclosure policy and publish a security.txt file to encourage responsible reporting.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Cal.com
Description
A fully customizable scheduling software for individuals, businesses taking calls and developers building scheduling platforms where users meet users.
Key services
customizable scheduling software, scheduling platform development
Content quality
good
Branding
consistent

Technology

Stack
Framer, Cloudflare DNS
Frameworks
Framer
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enabled
  • Domain status includes clientDeleteProhibited, clientRenewProhibited, clientTransferProhibited, clientUpdateProhibited

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

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

Key observations

  1. Website uses Framer for design and hosting is via Cloudflare DNS.
  2. No explicit privacy, cookie, or terms of service policies found in the HTML content.
  3. No contact emails, phone numbers, or physical addresses found in the provided content.
  4. No security.txt or vulnerability disclosure information found.
  5. No social media links explicitly found in the provided HTML snippet.
  6. Website content is business-focused and professional.
  7. No signs of adult or questionable content.
  8. WHOIS data shows domain is well maintained with long expiry date and protection statuses.
  9. No WAF or blocking mechanisms detected.
Technical notes

Notes

The website is built using Framer, a modern design and prototyping tool, indicating a contemporary front-end technology stack. Hosting and DNS are managed via Cloudflare, providing performance and security benefits. The site uses Google Fonts for typography and includes Open Graph and Twitter Card metadata for social media optimization. Performance is moderate with good mobile optimization and basic accessibility features. SEO is supported by proper meta tags and canonical links. However, the absence of advanced security headers and DNSSEC indicates technical debt in security implementation. The website lacks visible analytics or tracking scripts, suggesting minimal user tracking. Overall, the technical infrastructure is solid for content delivery and user experience but requires enhancements in security and privacy compliance.
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 +8Low24 findingsView report
  2. 68/100Medium26 findingsView report
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