CVE-2021-43530 json
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a…
published 2021-12-08 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30459
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 72%
- public exploits
- 0
- none known
Summary
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94.
Patch / fix
- Mozilla Firefox 94
Exploit prediction
1.41% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- Mozilla Firefox
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
mozilla.org
/security/advisories/mfsa2021-48/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1736886
issue-tracking, permissions-required
Sources
- CVE List CVE-2021-43530
- NVD CVE-2021-43530
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