CVE-2020-6830

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-26 · updated 2026-08-19
Weakness: CWE-200

Description

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 for Android: before 25.0 — fixed in 25.0

How to fix

Upgrade to a fixed version: Mozilla Firefox for Android 25.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1632387
https://www.mozilla.org/security/advisories/mfsa2020-15/
https://bugzilla.mozilla.org/show_bug.cgi?id=1632387
https://www.mozilla.org/security/advisories/mfsa2020-15/

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