CVE-2019-11711: Debian Linux

High severity, CVSS 8.8. EPSS: 1.6% chance of exploitation in the next 30 days.

When an inner window is reused, it does not consider the use of document.domain for cross-origin protections. If pages on different subdomains ever cooperatively use document.domain, then either page can abuse this to inject script into arbitrary pages on the other subdomain, even those that did not use document.domain to relax their origin security. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

Affected products

• Debian Debian Linux: version 8.0 only
• Mozilla Firefox: before 60.8.0 (fixed in 60.8.0); before 68.0 (fixed in 68.0)
• Mozilla Thunderbird: before 60.8.0 (fixed in 60.8.0)

Published 2019-07-23. Last modified 2026-06-17.