CVE-2020-6830: Mozilla Firefox Mobile

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

For native-to-JS bridging, the app requires a unique token to be passed that ensures non-app code can't call the bridging functions. That token was being used for JS-to-native also, but it isn't needed in this case, and its usage was also leaking this token. This vulnerability affects Firefox for iOS < 25.

Affected products

• Mozilla Firefox Mobile: before 25.0 (fixed in 25.0)

Published 2020-05-26. Last modified 2026-08-19.