A prominent online marketer that helps websites deliver targeted ads has been exploiting a decade-old browser flaw that leaks the history of websites that users visit, a researcher from Stanford University reported.
Epic Marketplace doesn't use the well-documented browser history leak to track specific websites a user has clicked on, Stanford graduate student Jonathan Mayer said. But it does employ advanced code that tests thousands of visited links per second to compile visitors' interests, including home improvement, pregnancy and fertility, and the repair of bad credit, he said.