CVE-2019-11738: Mozilla Firefox

Medium severity, CVSS 6.3. EPSS: 1.4% chance of exploitation in the next 30 days.

If a Content Security Policy (CSP) directive is defined that uses a hash-based source that takes the empty string as input, execution of any javascript: URIs will be allowed. This could allow for malicious JavaScript content to be run, bypassing CSP permissions. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

Affected products

• Mozilla Firefox: before 69.0 (fixed in 69.0)
• Mozilla Firefox ESR: before 68.1.0 (fixed in 68.1.0)
• Opensuse Leap: version 15.0 only; version 15.1 only

Published 2019-09-27. Last modified 2026-06-17.