Source Defense

Source Defense is the market leader in client-side web security, providing real time threat protection against vulnerabilities originating in third-party scripts such as Magecart & Formjacking attacks.

Source Defense provides an entirely new and unique solution preventing website supply chain attacks that existing security solutions cannot prevent.

Source Defense was founded in 2014 by Hadar Blutrich and Avital Grushcovski. The company is headquartered in Rosh Ha'Ayin, Rosh Ha'Ayin, Israel, with an office in Stamford, Connecticut.

Source Defense uses a first-of-its-kind, real-time sandbox isolation technology to provide a unique client-side website security solution focused on preventing malicious activity originating from website supply chain vendors.

Source Defense, with its patented VICE platform, protects web pages from vulnerabilities in third-party scripts. Source Defense's solution isolates those scripts from the web page and allows them to read and write according to a given permission either defined by Source Defense's recommended standards, or specific company policies.


Source Defense provides a unique website security solution focused on preventing malicious activity originating in website supply chain vendors. Using its patented technology, based on machine learning and industry best practices, Source Defense provides customers with a fully automated and dynamic solution that controls access and permissions of various dynamic components operating on a website.


Source Defense is backed by Capital One Ventures, JVP, Allegis Cyber, Global Brain, NightDragon and others. The company raised $10.5M in a Series A+ round on May 19, 2020. This brings Source Defense's total funding to $20.5M to date.



  • Year founded: 2014
  • Funding Info: $20.5M over 3 Rounds (Latest Funding Type: Series A+)
  • Yearly Revenue: NA
  • Employee Size: 11-50
  • Business Valuation: NA
  • City/Town: Rosh Ha'Ayin
  • State: Rosh Ha'Ayin
  • Country: Israel
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