CVE-2010-4043: Opera Browser

Medium severity, CVSS 4.3. EPSS: 2% chance of exploitation in the next 30 days.

Opera before 10.63 does not prevent interpretation of a cross-origin document as a CSS stylesheet when the document lacks a CSS token sequence, which allows remote attackers to obtain sensitive information via a crafted document.

Affected products

• Opera Opera Browser: up to and including 10.62; version 5.0 only; version 5.02 only; version 5.10 only; version 5.11 only; version 5.12 only; …

Published 2010-10-21. Last modified 2026-06-16.