CVE-2012-4142: 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, ignores some characters in HTML documents in unspecified circumstances, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted 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.