CVE-2026-15718: Mozilla Firefox

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 140.13, and Thunderbird 140.13.

Affected products

• Mozilla Firefox: before 152.0.6 (fixed in 152.0.6)

Published 2026-07-14. Last modified 2026-07-22.