Source Defense

Source Defense is a private Israeli cybersecurity company operating in the client-side security space. Detailed public information about the company — including founding year, founders, office locations, funding rounds, and headcount — is limited and not sufficiently verified to publish here.

The company focuses on protecting web pages from threats introduced by third-party scripts, such as marketing technology vendors, widgets, and other external tools that execute in the end user's browser. The problem it addresses is commonly referred to in the industry as client-side supply chain attacks, where adversaries exploit third-party code to steal payment data or personal information directly from the browser.