AVG's Web TuneUp software is marketed as a free way for users to defend themselves from "hidden [malware] threats".
But earlier this month Google's security team spotted that it was overriding safety features built into the search firm's Chrome browser, putting millions of people's personal data at risk.
http://www.bbc.com/news/technology-35198435
[with acknowledgement to "Paddy" for posting at Landzdown]