The Delete Private Data feature in Opera before 11.01 does not properly implement the "Clear all email account passwords" option, which might allow physically proximate attackers to access an e-mail account via an unattended workstation.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12507
https://exchange.xforce.ibmcloud.com/vulnerabilities/65018
http://www.vupen.com/english/advisories/2011/0231
http://www.securityfocus.com/bid/46036
http://www.opera.com/support/kb/view/986/
http://www.opera.com/docs/changelogs/windows/1101/
http://www.opera.com/docs/changelogs/unix/1101/
http://www.opera.com/docs/changelogs/mac/1101/