CVE-2020-6830 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 2020-05-26 6 y ago modified 2026-08-19 2 mo ago also EUVD-2020-27974
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- 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 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.
Patch / fix
- Mozilla Firefox for iOS 25
Exploit prediction
0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- Mozilla Firefox for iOS
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
mozilla.org
/security/advisories/mfsa2020-15/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1632387
permissions-required
Sources
- CVE List CVE-2020-6830
- NVD CVE-2020-6830
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