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Security report for nos.pt

NOS · Telecommunications · Portugal

Medium risk. 6 critical or high findings in GDPR outside view, SSL/TLS and 1 other check.

Security score

60/100

Risk levelMedium

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

NOS is a major Portuguese telecommunications company offering a wide range of services including 5G mobile networks, fixed and mobile internet, television, telephone, and alarm systems. The website reflects a mature digital presence with a comprehensive online store and customer support resources. The company targets general consumers in Portugal and maintains a strong market position as a leading telecom operator. Technically, the site leverages Adobe Experience Manager, Salesforce SDKs, and Google marketing and analytics tools, indicating a modern and integrated infrastructure. Security posture is solid with HTTPS, cookie consent, and bot protection, though explicit security policies and vulnerability disclosure mechanisms are not publicly available. Overall, the website is professional, trustworthy, and compliant with GDPR requirements, supporting NOS's credibility and customer engagement.

Scanned

NIS2 and GDPR posture

GDPR outside view
40/ 100 · High
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

6 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.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • High

      Third-party services without privacy policy

      Detected services: Google Analytics, Facebook, LinkedIn, YouTube

      What to do: Document all third-party data sharing in your privacy policy

  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 nos.pt

This scan found 24 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
32
Security headers
75
Email security
60
DNS health
50
Network security
100
GDPR outside view
40
Average
60

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 nos.pt, from OffSeq Breach.

Total records
200,254
Employees
212
Customers
198,924
Third parties
1,118
Weak passwords
16%

Latest record dated 2026-06-06 · 507 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 nos.pt.

Select it in the checkout above.

Masked preview

  • –login.nos.pt2026-06-06
  • –portal.cloudcc.nos.pt2026-05-28
  • –login.nos.pt2026-05-27
  • –login.nos.pt2026-05-26
  • –www-nsh.vpn.nos.pt2026-05-26

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

NOS operates in the telecommunications sector in Portugal, providing bundled services that include mobile, internet, TV, and security alarms. The business model is focused on consumer subscriptions and device sales through an online store. The company demonstrates strong branding consistency and trust signals such as official contact details and social media presence. The website's navigation and content structure support customer self-service and product discovery, enhancing user experience. NOS's integration with Salesforce and Adobe platforms suggests a sophisticated CRM and marketing ecosystem. The absence of publicly disclosed security certifications or incident response policies indicates areas for potential improvement in transparency and security governance.

Security posture

The website employs HTTPS with strong SSL configuration and uses security best practices such as cookie consent management and Google reCAPTCHA to mitigate automated threats. However, there is no explicit mention or public documentation of security policies, incident response plans, or vulnerability disclosure programs. Security headers like Content-Security-Policy and X-Frame-Options were not explicitly detected in the provided data, which could be enhanced. No vulnerabilities or exposed sensitive data were found in the HTML content. Overall, the security posture is good but could benefit from increased transparency and additional header implementations to harden defenses.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency and customer trust.
  2. Implement and explicitly declare Content-Security-Policy and other security headers to enhance protection against common web attacks.
  3. Create and host a security.txt file to facilitate responsible vulnerability disclosure.
  4. Enhance accessibility features to meet higher compliance standards and improve user experience for all users.
  5. Regularly audit and update third-party scripts and SDKs to mitigate risks from external dependencies.

Contact details published on the site

Addresses
Legal name
NOS
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
NOS
Description
Liga-te à rede 5G com os nossos tarifários móveis ou pacotes de Internet e televisão. Internet fixa e móvel, loja online com smartphones e muito mais.
Key services
5G mobile network, Fixed and mobile internet, Television services, Telephone services, Alarm and security solutions, Online retail of smartphones and gadgets
Content quality
good
Branding
consistent

Technology

Stack
Adobe Experience Manager (AEM), Google Tag Manager, Google reCAPTCHA, Cookiebot, Salesforce SDKs, Helix RUM (Adobe), JavaScript ES6+
Frameworks
Adobe Experience Manager, Salesforce Lightning Design System
Platforms
Web, Mobile responsive
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • Use of HTTPS
  • Cookie consent with opt-in/opt-out
  • Use of Google reCAPTCHA for bot protection
  • No exposed sensitive data in HTML
  • Use of Adobe Helix RUM for monitoring

Analytics and tracking

Services
Google Analytics (via Google Tag Manager), Adobe Helix RUM
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google Ads (AW-610647209)
Tracking pixels
Cookiebot
Marketing tools
Cookiebot, Adobe Helix RUM
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Comprehensive cookie consent mechanism implemented with clear user options.
  3. Use of modern web technologies and frameworks.
  4. Clear business contact information and structured data present.
  5. No explicit security or incident response policies publicly disclosed.
  6. Good integration of marketing and analytics tools with privacy compliance.
  7. Content is professionally presented and relevant to telecommunications consumers.
  8. No suspicious or malicious external domains detected.
Technical notes

Notes

The website is built on Adobe Experience Manager, integrating Salesforce Lightning Design System and various Salesforce SDKs, indicating a robust enterprise-grade CMS and CRM integration. Google Tag Manager and Cookiebot are used for analytics and consent management, respectively. The site is mobile responsive with good SEO practices including meta tags and structured data. Performance is moderate, with potential for optimization in loading times and script management. Accessibility is basic and could be improved. The technical stack supports a comprehensive digital marketing and e-commerce experience, but continuous monitoring and updates are recommended to maintain security and performance.
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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