Auth bypass in Mozilla Firefox
CVE-2020-6823
A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the redirect_uri, and through the Promise returned, obtain the Auth code and gain access to the user's account at the service provider. This vulnerability affects Firefox < 75.
Vulnerability class: Broken Access Control
EPSS: 0.016 (73.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Mozilla Firefox — versions unspecified
Weakness classification (CWE)
References
- security@mozilla.org (Third Party Advisory, x_refsource_MISC)
- security@mozilla.org (x_refsource_MISC, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-6823?
- CVE-2020-6823 is a critical-severity vulnerability in Mozilla Firefox, classified under Missing Authorization. CVSS score: 9.8/10. Published 2020-04-24.
- How severe is CVE-2020-6823?
- Critical severity. CVSS v3 base score is 9.8 out of 10.