CVE-2021-38491: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

Mixed-content checks were unable to analyze opaque origins which led to some mixed content being loaded. This vulnerability affects Firefox < 92.

Affected products

• Mozilla Firefox: before 92.0 (fixed in 92.0)

Published 2021-11-03. Last modified 2026-06-17.