CVE-2012-4144: Opera Browser

Medium severity, CVSS 4.3. EPSS: 1.2% chance of exploitation in the next 30 days.

Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, does not properly escape characters in DOM elements, which makes it easier for remote attackers to bypass cross-site scripting (XSS) protection mechanisms via a crafted HTML document.

Affected products

• Opera Opera Browser: up to and including 12.00; version 12.00 only; up to and including 11.65; version 10.00 only; version 10.01 only; version 10.10 only; …

Published 2012-08-06. Last modified 2026-06-16.