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CVE-2021-43530

MediumPublished

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...

Published: Dec 8, 2021
Updated: Aug 4, 2024
Assigning CNA: mozilla
Evidence observed: Aug 8, 2026

Primary CVSS

6.1/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS probability estimate

1.4%

Low · next 30 days

Percentile: 70.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2021-43530-UXSS-On-QRcode-Reader-PoC
Proof-of-concept for CVE-2021-43530, a Universal XSS vulnerability in Firefox for Android caused by improper URL sanitization when processing QR code scans.

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