CVE-2004-2491: Opera Browser

Low severity, CVSS 2.6. EPSS: 6.3% chance of exploitation in the next 30 days.

A race condition in Opera web browser 7.53 Build 3850 causes Opera to fill in the address bar before the page has been loaded, which allows remote attackers to spoof the URL in the address bar via the window.open and location.replace HTML parameters, which facilitates phishing attacks.

Affected products

• Opera Opera Browser: up to and including 7.53

Published 2004-12-31. Last modified 2026-06-16.