CVE-2011-4682: Opera Browser

Medium severity, CVSS 6.4. EPSS: 2% chance of exploitation in the next 30 days.

The JavaScript engine in Opera before 11.60 does not properly implement the in operator, which allows remote attackers to bypass the Same Origin Policy via vectors related to variables on different web sites.

Affected products

• Opera Opera Browser: up to and including 11.60; version 5.0 only; version 5.02 only; version 5.10 only; version 5.11 only; version 5.12 only; …

Published 2011-12-07. Last modified 2026-06-16.