CVE-2025-55029: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Malicious scripts could bypass the popup blocker to spam new tabs, potentially resulting in 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.