CVE-2020-12404 json
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.
published 2020-07-09 6 y ago modified 2026-08-19 2 mo ago also EUVD-2020-4716
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Mozilla Firefox for iOS 26
Exploit prediction
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:P/I:N/A:N |
Affected products
- Mozilla Firefox for iOS
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
mozilla.org
/security/advisories/mfsa2020-19/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1631739
issue-tracking, permissions-required, vendor-advisory
Sources
- CVE List CVE-2020-12404
- NVD CVE-2020-12404
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.