Pentesting Providers
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Cure53

Berlin-based web, browser, and cryptography auditors founded by Dr. Mario Heiderich, trusted by ExpressVPN, NordVPN, 1Password, and Bitwarden.

Featured in: Best Web App Pen Testing Companies

Headquarters
Berlin, Germany
Founded
2013
Team Size
11-50
Geography
Global
Markets
Europe, Global
Last verified: Sept 2026

Key facts

  • Holds OSCP Employer accreditation.
  • Founded in 2013.
  • Headquartered in Berlin, Germany.
  • Team of 11-50 security professionals.
  • Delivers 5 penetration testing services.
  • Typical response time: 2-4 weeks.
  • Operates globally, with delivery across Europe.
  • Specialises in Browser Security, XSS and DOM Security, and Cryptographic Audit.
  • Compliance expertise across GDPR and ISO 27001.
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About

Cure53 is a highly specialized cybersecurity auditing firm based in Berlin, Germany, renowned for their expertise in web security, browser security, and cryptographic protocol review. Founded in 2013 by Dr. Mario Heiderich, the firm has built an exceptional reputation through hundreds of published audit reports for some of the world's most prominent open-source projects and technology companies.

Accreditations

OSCP Employer

Services

Web Application Penetration TestingAPI Penetration TestingSource Code ReviewConfiguration ReviewMobile App Penetration Testing

Compliance Expertise

GDPRISO 27001

Best For

EnterpriseStartup
Industries
TechnologyTelecommunications

Methodologies

OWASPPTES

Team Activity

Speaker: AppSec EU
Speaker: LocoMocoSec
Speaker: RuhrSec
Open source: DOMPurify
Open source: HTTPLeaks

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