CVE-2025-4090: Mozilla Firefox

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability existed in Thunderbird for Android where potentially sensitive library locations were logged via Logcat. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

Affected products

• Mozilla Firefox: before 138.0 (fixed in 138.0)
• Mozilla Thunderbird: before 138.0 (fixed in 138.0)

Published 2025-04-29. Last modified 2026-09-30.