CVE-2007-3827: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 0.9% chance of exploitation in the next 30 days.

Mozilla Firefox allows for cookies to be set with a null domain (aka "domainless cookies"), which allows remote attackers to pass information between arbitrary domains and track user activity, as demonstrated by the domain attribute in the document.cookie variable in a javascript: window.

Affected products

• Mozilla Firefox: any version

Published 2007-07-17. Last modified 2026-06-16.