CVE-2025-55028: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Malicious scripts utilizing repetitive JavaScript alerts could prevent client user interaction in some scenarios and allow for denial of service attacks. This vulnerability was fixed in Firefox for iOS 142.

Affected products

• Mozilla Firefox: before 142.0 (fixed in 142.0)

Published 2025-08-19. Last modified 2026-10-05.