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


Source Defense’s product is designed to extend website security to the client side, to protect enterprise websites from digital skimming, formjacking and magecart attacks, which cost organizations thousands.


Source Defense’s main utility lies in its ability to protect against automated attacks and client-side threats that target their websites, with data-breach monitoring to help detect website skimming, formjacking and supply chain attacks early.


Source Defense's patented VICE platform protects web pages from vulnerabilities in third-party scripts. Its 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 is backed by Capital One Ventures, JVP, Springtide Ventures, Allegis Cyber, Global Brain, NightDragon, and others. The company raised $27M in a Series B round on Apr 26, 2022. This brings Source Defense's total funding to $47.5M to date.



  • Year founded: 2014
  • Funding Info: $47.5M over 4 Rounds (Latest Funding Type: Series B)
  • Yearly Revenue: NA
  • Employee Size: 51-200
  • Business Valuation: NA
  • City/Town: Rosh Ha'Ayin
  • State: Rosh Ha'Ayin
  • Country: Israel
Related businesses