Web sites vulnerable to phishing attacks
In a research paper published by Google titled “The Ghost in the Browser,” researchers claimed that third-party widgets were one of the primary vectors of attack for a website to get infected with malware.
We identified a free statistics counter that operated fine for almost four years, “when the nature of the counter changed and instead of cataloging the number of visitors, it started to exploit every user visiting pages linked to the counter… In this particular case, the user visited a completely unrelated web site that was hosting a third-party web counter. The web counter was benign for over four years and then drastically changed behavior to exploit any user visiting the site. This clearly demonstrates that any delegation of web content should only happen when the third party can be trusted.”