CVE-2004-1381: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 6.9% chance of exploitation in the next 30 days.

Firefox before 1.0 and Mozilla before 1.7.5 allow inactive (background) tabs to focus on input being entered in the active tab, as originally reported using form fields, which allows remote attackers to steal sensitive data that is intended for other sites, which could facilitate phishing attacks.

Affected products

• Mozilla Firefox: version 0.8 only; version 0.9 only; version 0.9.1 only; version 0.9.2 only; version 0.9.3 only; version 0.10 only; …
• Mozilla Mozilla: any version; version 1.3 only; version 1.4 only; version 1.4.1 only; version 1.5 only; version 1.5.1 only; …

Published 2004-10-20. Last modified 2026-06-16.