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Security report for yollaesim.com

Yolla eSIM · Telecommunications · N/a

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

Security score

69/100

Risk levelMedium

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

Yolla eSIM is a telecommunications service provider specializing in offering eSIM data plans for over 91 countries worldwide. Their business model focuses on providing affordable mobile internet connectivity for travelers through a web platform and a dedicated mobile app. The company appears to be a small-sized entity founded in 2020, with a clear market position targeting global travelers seeking cost-effective data roaming solutions. Technically, the website is built on a modern React and Next.js stack with Material-UI components, delivering a good user experience and mobile optimization. However, some SEO and accessibility aspects could be improved. Security-wise, the site enforces HTTPS and has domain transfer protections but lacks visible security headers and explicit security policies, which could be enhanced to strengthen trust and compliance. Overall, the website is professional and functional with moderate trustworthiness and no blocking or WAF interference detected.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 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 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 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 yollaesim.com

This scan found 23 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

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Full report

€39.90one-time

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Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
30
Email security
85
DNS health
80
Network security
100
GDPR outside view
68
Average
69

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

Yolla eSIM operates in the telecommunications sector, focusing on eSIM technology for global mobile internet access. Their competitive advantage lies in offering a wide range of country-specific and regional data plans at local rates, accessible via an easy-to-use app and website. The business targets international travelers and digital nomads who require seamless connectivity without physical SIM cards. Revenue streams likely include direct sales of eSIM data plans. The company maintains a partnership ecosystem, including related services like Yolla Calls for VoIP communications. Growth indicators include continuous expansion of supported devices and countries. Strategic observations suggest opportunities in expanding security transparency and enhancing customer contact channels.

Security posture

The current security posture is moderate. The website uses HTTPS and has domain registration protections, but lacks implementation of key security headers such as Content Security Policy, HSTS, and X-Frame-Options. No public security or incident response policies are found, and no vulnerability disclosure or security.txt files are present. The absence of direct contact emails or phone numbers for security or abuse reporting reduces incident response readiness. No vulnerabilities or exposed sensitive data were detected in the analysis. Compliance with GDPR is partial, with privacy and cookie policies present but no explicit GDPR statements. Overall, the security maturity is adequate but could benefit from improvements in headers, policies, and transparency.

Recommendations

  1. Implement comprehensive HTTP security headers including CSP, HSTS, and X-Frame-Options to mitigate common web attacks.
  2. Publish explicit security and incident response policies, including contact channels for security issues (e.g., security@ or abuse@ emails).
  3. Enable DNSSEC for the domain to enhance DNS security and prevent spoofing.
  4. Improve website accessibility features to meet recognized standards and enhance user inclusivity.
  5. Add a vulnerability disclosure policy or security.txt file to encourage responsible reporting and improve security culture.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Yolla eSIM
Description
Yolla eSIM offers mobile internet plans for over 91 countries around the world. Get data packs at cheap rates and stay connected on your trip. With YOLLA eSIM, you can select mobile internet plans for over 91 countries/regions worldwide. Get data travel packs at affordable rates, directly at departure, and stay connected! Avoid roaming charges, purchase a suitable plan before you go.
Key services
eSIM data plans for 91+ countries, Mobile app for managing and replenishing eSIMs
Content quality
good
Branding
consistent

Technology

Stack
React, Next.js, Material-UI, JavaScript
Frameworks
Next.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
70/100
Good practices seen
  • HTTPS enforced
  • Domain status clientTransferProhibited

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

Advertising

Tracking pixels
Crisp Chat, CookieYes
Marketing tools
CookieYes consent management
Transparency
basic

Site quality

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

Key observations

  1. Website offers clear eSIM data plans with global coverage
  2. Mobile app available for iOS to manage eSIMs
  3. Comprehensive FAQ including device compatibility
  4. No direct company emails or phone numbers publicly listed
  5. No explicit security or incident response policies found
  6. No visible security headers in HTTP response
  7. No social media links detected
  8. Uses modern React/Next.js tech stack
  9. Cookie consent implemented via CookieYes
  10. No WAF or blocking detected
Technical notes

Notes

The website is built on a modern React and Next.js framework with Material-UI for UI components, indicating a contemporary and maintainable tech stack. The site loads asynchronously with chunked JavaScript, supporting performance optimization. Mobile optimization is good, with responsive design and viewport meta tags. SEO is basic with meta description and title tags but lacks keywords and Open Graph tags. No CMS is detected, suggesting a custom or headless approach. Hosting provider details are not explicit. Performance is moderate, with room for improvement in accessibility and SEO. No critical technical debt or vulnerabilities were identified, but security headers are missing, which is a technical risk. Overall, the infrastructure supports the business needs but could be enhanced for security and SEO.
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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