CVE-2019-11720: Mozilla Firefox

Medium severity, CVSS 6.1. EPSS: 1.1% chance of exploitation in the next 30 days.

Some unicode characters are incorrectly treated as whitespace during the parsing of web content instead of triggering parsing errors. This allows malicious code to then be processed, evading cross-site scripting (XSS) filtering. This vulnerability affects Firefox < 68.

Affected products

• Mozilla Firefox: before 68.0 (fixed in 68.0)
• Opensuse Leap: version 15.0 only; version 15.1 only

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