Opera before 11.60 does not properly consider the number of . (dot) characters that conventionally exist in domain names of different top-level domains, which allows remote attackers to bypass the Same Origin Policy by leveraging access to a different domain name in the same top-level domain, as demonstrated by the .no or .uk domain.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Freebsd | — | Upgrade operaUpgrade opera-develUpgrade linux-opera | Dec 10, 2025 | Dec 13, 2011 |
| Gentoo Linux | — | Upgrade www-client/opera. | Oct 30, 2017 | Dec 7, 2011 |
| Suse | — | Upgrade opera-kde4Upgrade opera-gtkUpgrade opera | Dec 12, 2013 | Dec 7, 2011 |
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