At the Defcon hacker conference next week, Alejandro Caceres and Jason Hopper plan to release—or, rather, to upgrade and re-release after a years-long hiatus—a tool called PunkSpider. Essentially a search engine that constantly crawls the entire web, PunkSpider automatically identifies hackable vulnerabilities in websites, and then allows anyone to search those results to find sites susceptible to everything from defacement to data leaks.