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Security report for threema.ch

Threema GmbH · Technology · Switzerland

Low risk. 4 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

78/100

Risk levelLow

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

Threema GmbH operates a highly secure instant messaging platform developed in Switzerland, targeting individuals and organizations that prioritize privacy and data protection. The company offers end-to-end encrypted messaging, calls, and file exchange services, with specialized products such as Threema Work for enterprises, Threema Broadcast, and Threema Gateway. The website reflects a mature market position with strong trust signals including GDPR compliance and endorsements from public authorities and large enterprises. Technically, the site employs modern JavaScript frameworks and privacy-respecting analytics (Matomo), with excellent mobile optimization and SEO practices. Security posture is strong with HTTPS enforcement and domain protection, though improvements like DNSSEC and security headers could enhance it further. Overall, the website is professional, trustworthy, and well-aligned with the company's business model and market presence.

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 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

  3. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • High

      Domain Expires Soon

      Domain expires in 10 days

      What to do: Renew domain registration before expiration

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

Keep watching threema.ch

This scan found 17 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
80
Security headers
80
Email security
65
DNS health
75
Network security
100
GDPR outside view
65
Average
78

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 threema.ch, from OffSeq Breach.

Total records
2,024
Employees
1
Customers
1,909
Third parties
114
Weak passwords
17%

Latest record dated 2025-07-23 · 15 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 threema.ch.

Select it in the checkout above.

Masked preview

  • –threema.ch2025-07-23

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

Threema is positioned as a privacy-first secure communication provider with a clear focus on GDPR compliance and serving sectors such as government, healthcare, and enterprise. Their business model revolves around paid enterprise solutions alongside private user offerings. The company benefits from a strong brand reputation, evidenced by client logos from notable organizations. The multilingual website and comprehensive resources indicate a global outreach strategy. The absence of direct contact details on the main site suggests a controlled communication approach, likely through dedicated portals. The company maintains domain registration consistency and a stable online presence since 2012, supporting business credibility.

Security posture

The website demonstrates a solid security foundation with HTTPS and domain status protections. However, the lack of DNSSEC and absence of published security policies or incident response contacts represent areas for enhancement. The use of Matomo analytics aligns with privacy-conscious practices, minimizing invasive tracking. No vulnerabilities or exposed sensitive data were detected in the content. The site does not currently provide a vulnerability disclosure or security.txt file, which could improve transparency and incident handling readiness. Overall, the security posture is robust but could benefit from formalized public security documentation and additional DNS security measures.

Recommendations

  1. Enable DNSSEC on the domain to strengthen DNS security and prevent spoofing.
  2. Publish a dedicated security policy and incident response contact information on the website.
  3. Implement a cookie consent mechanism to ensure full compliance with privacy regulations.
  4. Add security headers such as Content-Security-Policy and X-Content-Type-Options to enhance browser security.
  5. Provide a vulnerability disclosure policy or security.txt file to facilitate responsible reporting.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Threema GmbH
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 and file exchange, Threema Work (enterprise solution), Threema Broadcast, Threema Gateway
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Alpine.js, Matomo Analytics, CSS, HTML5
Frameworks
Alpine.js
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Domain status includes clientDeleteProhibited and clientTransferProhibited
  • No DNSSEC enabled (potential improvement area)
  • No exposed sensitive data detected in HTML
  • Use of end-to-end encryption emphasized

Analytics and tracking

Services
Matomo
Tracking level
minimal
Privacy practices
good

Advertising

Tracking pixels
Matomo
Marketing tools
Matomo Analytics
Transparency
basic

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 emphasis on privacy and security with GDPR compliance
  3. No direct contact emails or phone numbers found on main pages
  4. Multiple language support with canonical and hreflang tags
  5. Use of Matomo analytics indicates privacy-conscious tracking
  6. No cookie consent banner detected, potential compliance gap
  7. No explicit security policy or incident response info publicly available
  8. No security.txt or vulnerability disclosure found
  9. WHOIS data shows domain is well maintained and protected
Technical notes

Notes

The website uses a modern tech stack including Alpine.js for interactivity and Matomo for privacy-focused analytics. The site is well-structured with proper meta tags, hreflang for multilingual support, and responsive design ensuring excellent mobile usability. Hosting details are not explicit but domain registration and DNS setup indicate a Swiss-based infrastructure. Performance appears optimized with preloading of CSS and JavaScript modules. No CMS was detected, suggesting a custom or static site architecture. Technical risks are minimal, though the absence of DNSSEC and some security headers represent minor gaps. Overall, the technical implementation supports a secure, performant, and user-friendly experience.
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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