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Security report for threema.id

Threema · Technology · Switzerland

Low risk. 4 critical or high findings in GDPR outside view and SSL/TLS.

Security score

76/100

Risk levelLow

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

Threema is a Swiss-based company providing highly secure, end-to-end encrypted communication services tailored for individuals, businesses, and government entities. The company emphasizes privacy, GDPR compliance, and zero-knowledge security, positioning itself as a trusted alternative to mainstream messaging platforms. Their product suite includes Threema Work, Broadcast, and Gateway, catering to various secure communication needs. The website reflects a professional and consistent brand image with a focus on security and privacy. Technically, the site uses modern JavaScript frameworks and privacy-respecting analytics (Matomo), with good mobile optimization and SEO practices. Security posture is solid with HTTPS and domain protections, though DNSSEC is not enabled and security headers are not explicitly detected in the provided data. No explicit privacy or cookie policies were found in the provided content, which is a gap in privacy compliance. Overall, the domain registration data aligns well with the business claims, supporting legitimacy and trustworthiness.

Scanned

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

4 findings rated critical or high. Fix these first.

  1. 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

  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 threema.id

This scan found 19 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
57
Security headers
80
Email security
65
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

Threema operates in the secure communication technology sector, targeting privacy-conscious users and organizations including government and large enterprises. Their competitive advantage lies in strong privacy guarantees, Swiss jurisdiction, and GDPR compliance. The business model revolves around paid products for business communication and secure messaging apps for individuals. The presence of reputable clients like Mercedes-Benz Group AG and public authorities enhances market credibility. The company maintains a multilingual website to address a broad international audience. Strategic partnerships or subsidiaries were not identified in the provided data. The company appears medium-sized with a mature market presence since 2012.

Security posture

Threema demonstrates a mature security posture with end-to-end encryption as a core feature. The website uses HTTPS and domain registration protections to prevent unauthorized changes. However, DNSSEC is not enabled, which could be improved to protect DNS integrity. No security.txt or vulnerability disclosure information was found, which limits transparency in incident response. The absence of explicit security headers in the provided data suggests room for enhancement in web security best practices. No exposed sensitive data or vulnerable libraries were detected. Incident response contact channels are not publicly visible. Overall, the security posture is good but could benefit from improved transparency and DNS security.

Recommendations

  1. Publish clear and accessible privacy and cookie policies with consent mechanisms to improve GDPR compliance.
  2. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  3. Implement and verify security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  4. Provide a publicly accessible security policy and vulnerability disclosure program including security.txt and incident response contacts.
  5. Enhance accessibility features on the website to improve inclusivity and compliance with standards.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Threema
Description
The secure instant messenger from Switzerland. GDPR-compliant chat app for individuals and organizations that value security and data protection. Trusted by millions.
Key services
End-to-end encrypted messaging, Encrypted calls, File exchange, Threema Work, Threema Broadcast, Threema Gateway
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, CSS, Matomo Analytics
Frameworks
Alpine.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

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

Analytics and tracking

Services
Matomo
Tracking level
minimal
Privacy practices
good

Advertising

Tracking pixels
Matomo
Marketing tools
Matomo Analytics
Transparency
basic

Site quality

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

Key observations

  1. Website is professionally designed and well-structured.
  2. Content is focused on privacy and security messaging.
  3. No explicit privacy or cookie policy pages detected in provided HTML snippet.
  4. Multiple language options available indicating international audience.
  5. Use of Matomo analytics suggests privacy-conscious tracking.
  6. No contact emails or phone numbers explicitly found in provided content.
  7. No visible security.txt or vulnerability disclosure information.
  8. WHOIS data shows domain is valid and not privacy protected.
Technical notes

Notes

The website employs modern web technologies including Alpine.js for interactivity and Matomo for privacy-focused analytics. The site is mobile optimized with responsive design and good SEO metadata. Performance is moderate with asynchronous script loading. The domain is registered with COREhub, S.R.L. and protected against unauthorized transfers and deletions. However, DNSSEC is not enabled, which is a technical risk. No CMS or hosting provider details were explicitly detected. The site lacks visible security headers in the provided data, which is a technical debt. Overall, the technical infrastructure is solid but could be improved with enhanced DNS security and web security headers.
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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