CVE-2020-12404

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-09 · updated 2026-08-19
Weakness: CWE-79

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 could leak when used for downloading files. This vulnerability affects Firefox for iOS < 26.

Affected products

Mozilla Firefox for Android: before 26.0 — fixed in 26.0

How to fix

Upgrade to a fixed version: Mozilla Firefox for Android 26.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1631739
https://www.mozilla.org/security/advisories/mfsa2020-19/
https://bugzilla.mozilla.org/show_bug.cgi?id=1631739
https://www.mozilla.org/security/advisories/mfsa2020-19/

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